Dissertations / Theses on the topic 'Perturbation (Quantum dynamics); Quantum electrodynamics'
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Грицунов, А. В., И. Н. Бондаренко, А. Б. Галат, О. В. Глухов, and А. Г. Пащенко. "On the quantum electrodynamics of nanosystems." Thesis, Kharkiv, bookfabrik, 2019. http://openarchive.nure.ua/handle/document/10408.
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Problems of quantum dynamics of nanoobjects essential for development of new nanoelectronic systems are discussed. According to the theory of natural oscillatory systems (NOSs), “interaction” between the objects is interpreted as a quantum-dynamic phenomenon meaning a stable trend arising from the quantum chaos. As an opposite, “interchange” is denominated as the permanent stochastic exchange with action quanta between different NOSs in 4D spacetime, being the physical base of the quantum chaos. The Tetrode-Wheeler-Feynman’s concept of “direct interparticle action” is reconciled with both the quantum radiation-absorption and the Coulomb interaction. A conservation law for the action is supposed as a necessary condition for the momentum-energy conservation. The “classic” conservation law for the momentum-energy is considered as derivative, being valid for the momentum as well as some physical value that is an integral over 3D space from a linear combination of stress-energy tensor principal diagonal terms. Such redefinition enables the unconditional quantization of the energy unlike “orthodox” quantum theory.
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Zhang, Ou, and Ou Zhang. "Effective Field Theories for Quantum Chromo- and Electrodynamics." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/621825.
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Effective field theories (EFTs) provide frameworks to systematically improve perturbation expansions in quantum field theory. This improvement is essential in quantum chromodynamics (QCD) predictions, both at low energy in the description of low momentum hadron-hadron scattering and at high energy in the description of electron-positron, proton-proton, proton-electron collisions. It is also important in quantum electrodynamics (QED), when electrons interact with a high-intensity, long-wavelength classical field. I introduce the principles and methods of effective field theory and describe my work in three EFTs: First, in the perturbative QCD region, I use soft collinear effective theory (SCET) to prove that strong interaction soft radiation is universal and to increase the QCD accuracy to next-to-next-to-next-to leading logarithm order for new particle searches in hadron colliders. I also compute a new class of non-perturbative, large logarithmic enhancement arising near the elastic limits of deep inelastic scattering and Drell-Yan processes. Second, in the QCD confinement region, I use heavy hadron chiral perturbation theory to study near-threshold enhancements in the scattering of 𝐷 and 𝜋 mesons near the threshold for the excited 𝐷-meson state, 𝐷*, as well as in the scattering of 𝐷 and 𝐷* mesons near the threshold for the exotic hadron X(3872). This work provides a clear picture of the hadronic molecule X(3872) and more profound understanding of the nuclear force between hadrons. Finally, inspired by SCET, I construct a new electron-laser effective field theory to describe highly-relativistic electrons traveling in strong laser fields, extract the universal distribution of electrons in strong electromagnetic backgrounds and its evolution in energy from the separated momentum scales of emitted photons and classical radiation, and predict the rate of wide angle photon emission. I conclude with limitations of EFT methods and some perspectives on what new work may be achieved with these EFTs.
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Hoffmann, Norah M. [Verfasser], and Ludwig [Akademischer Betreuer] Mathey. "Mixed Quantum-Classical Dynamics in Cavity Quantum Electrodynamics / Norah M. Hoffmann ; Betreuer: Ludwig Mathey." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1218707240/34.
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Bruhat, Laure. "Microwaves as a probe of quantum dot circuits : from Kondo dynamics to mesoscopic quantum electrodynamics." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEE012/document.
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Cette thèse utilise les micro-ondes pour étudier des circuits de boîtes quantiques à base de nanotubes de carbone. Dans une première expérience, l'excitation micro-onde est appliquée directement sur une électrode du circuit pour une boîte quantique dans le régime Kondo. Nous réalisons la première caractérisation fréquence-amplitude de la conductance Kondo à biais nul. Des données préliminaires sont en accord avec la prédiction d'universalité. Nous présentons deux autres expériences, où les boîtes quantiques sont insérées dans des résonateurs micro-ondes. Les photons de la cavité sondent la résistance de relaxation de charge et l'émission de photons dans une boîte quantique couplée à des réservoirs normaux et supraconducteurs, en présence de répulsion coulombienne. Nos observations valident une modélisation en termes de réponse linéaire du circuit. Nous présentons aussi la première implémentation d'une lame séparatrice à paires de Cooper en cavité. Le régime de couplage fort est atteint, une première avec des circuits de boîtes quantiques. Nos résultats renforcent l'idée que l'électrodynamique quantique mésoscopique est une boîte à outils fructueuse, aussi bien dans le contexte du domaine du transport quantique que dans celui de l'information quantiqueThis thesis uses microwaves as probe of carbon nanotube quantum dot circuits. In a first experiment, a microwave excitation is directly applied to a circuit electrode for a quantum dot in the Kondo regime. We provide the first frequency-amplitude characterisation of the Kondo zero-bias conductance. Preliminary data are consistent with predicted universal behaviour. We present two other experiments, where quantum dot circuits are embedded in microwave resonators. Cavity photons probe charge relaxation resistance and photon-emission in a quantum dot coupled to normal and superconducting reservoirs in presence of Coulomb repulsion. Our observations validate a modelling in terms of the circuit linear response. We also present the first implementation of a Cooper pair splitter in cavity. The strong coupling regime is achieved, a premiere with quantum dot circuits. Our findings support the idea, that mesoscopic quantum electrodynamics is a fruitful toolbox in the context of both fields of quantum transport and quantum information science
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Viennot, Jeremie. "Charge and spin dynamics in a hybrid circuit quantum electrodynamics architecture." Phd thesis, Ecole Normale Supérieure de Paris - ENS Paris, 2014. http://tel.archives-ouvertes.fr/tel-01062841.
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Cette thèse étudie expérimentalement le mécanisme de couplage entre les degrés de liberté de charge et de spin dans des doubles boîtes quantiques et des cavités supraconductrices de grande finesse. Nous utilisons des nanotubes de carbone comme conducteurs cohérents pour nos boîtes quantiques. Nous avons conçu une expérience et développé de nouvelles méthodes de fabrication afin de pouvoir contrôler ces dispositifs. Avec ces méthodes, nous examinons le couplage résonant entre les transitions électroniques de charge dans les boîtes quantiques et la cavité micro-onde. Nous poussons le système hors équilibre pour caractériser sa dynamique et extraire ses paramètres intrinsèques. Nous étudions la possibilité d'un couplage de photons uniques avec un spin électronique individuel, en utilisant des champs effectifs non colinéaires induits par des interfaces ferromagnétiques comme ingrédient clef pour construire ce couplage. Les résultats préliminaires dans cette architecture en circuit sont prometteurs pour de futures expériences d'électrodynamique quantique en cavité avec des spins uniques.
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Van, de Water Ruth S. "Applications of chiral perturbation theory to lattice QCD /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9730.
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Geshnizjani, Ghazal. "Back reaction of long wavelength perturbations during inflation /." View online version; access limited to Brown University users, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3174608.
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Donner, Ralf. "Numerical methods of resonant dynamics for the Galaxy." Thesis, University of Oxford, 2005. http://ora.ox.ac.uk/objects/uuid:136ae026-e3d4-4153-b124-edc8256c14c9.
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Numerical methods of resonant dynamics with applications to the Galaxy are considered in this thesis. We derive generating functions for first-order perturbation theory and the associated orbital frequencies by matrix calculus. For two action-angle spaces (J,θ) and (i,φ) related by a canonical map I·φ+s, we show that J can be averaged over ergodic orbits φ to provide an estimator of I to within O(|s|2). We provide examples in one and two dimensions and compare the technique to calculations of actions by numerical line integration in Poincaré sections. We then use spectral dynamics and the Laskar frequency map (Laskar, 1993) to identify the dynamically important resonances of the 'flattened' axisymmetric isochrone potential. We simulate resonant capture in a low-order resonance by populating representative tori of a spherical isochrone Hamiltonian and integrating the orbits while adiabatically introducing axisymmetry. We use the averaging technique described above to observe the fraction of orbits captured, and we compare the result to a theoretical prediction. We return to first-order perturbation theory to analyse its strengths and weaknesses, in particular near orbital pericentre, and when one action is significantly smaller than another. We also reproduce the expected pendulum dynamics in the resonant action-angle plane for orbits in our capture simulation. We develop the concept of adaptive dynamics: we vary the initial orbital energy of the particles in the capture simulations and show that resonant and non-resonant orbits can be identified as clusters in the perturbed action plane. For a given Hamiltonian, we use the perturbed frequencies and a linear regression fit in the action plane as diagnostics of a set of model Hamiltonians on a grid in a suitable parameter space. We find we are able to constrain the parameters of a model Hamiltonian by this method. Finally, we reject the null hypothesis that resonant structures in phase space can be found by traditional methods of density estimation.
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Ashley, Jonathan D. "Investigations in non-perturbative QCD." Title page, abstract and table of contents only, 2004. http://hdl.handle.net/2440/37959.
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In this thesis we review two methods for studying the non-pertubative region of QCD: the effective field theory, chiral perturbation theory (χPT), and the cloudy bag model, a successful chiral quark model of hadron structure. We use information from both of these sources to construct a simple extrapolation formula in the pion mass, mπ, for the nucleon electromagnetic form factors, which combines the correct non-analytic chiral behaviour predicted by (χPT), with the correct large mπ behaviour. This formula is applied to recent quenched lattice QCD results to extrapolate to the physical regime. Given the simple nature of the extrapolation scheme, our results compare surprisingly well with experiment. We also employ a simple chiral quark model (the hedgehog) to examine the volume and pion mass dependence of the axial coupling constant, ga, along with the hedgehog baryon mass. Our results for ga reveal large volume dependence at low pion masses.Thesis (M.Sc.)--School of Chemistry and Physics, 2004.
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Arndt, Daniel. "Chiral perturbation theory on the lattice and its applications /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/9693.
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Jenkins, Robert David. "Higher order energy transfer : quantum electrodynamical calculations and graphical representation." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327601.
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McKinley, Michael Scott. "Derivation of second-order boundary condition perturbation theory." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16073.
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Clark, Adam Benjamin. "Applications of conformal perturbation theory to novel geometries in the gauge/gravity correspondence /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/9789.
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Garofalo, Marco. "Dynamics of numerical stochastic perturbation theory." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31086.
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Numerical Stochastic Perturbation theory is a powerful tool for estimating high-order perturbative expansions in lattice quantum field theory. The standard algorithm based on the Langevin equation, however, suffers from several limitations which in practice restrict the potential of this technique: first of all it is not exact, a sequence of simulations with finer and finer discretization of the relevant equations have to be performed in order to extrapolate away the systematic errors in the results; and, secondly, the numerical simulations suffer from critical slowing down as the continuum limit of the theory is approached. In this thesis I investigate some alternative methods which improve upon the standard approach. In particular, I present a formulation of Numerical Stochastic Perturbation theory based on the Generalised Hybrid Molecular Dynamics algorithm and a study of the recently proposed Instantaneous Stochastic Perturbation Theory. The viability of these methods is investigated in φ4 theory.
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Beltran, Ramirez Jhosep Victorino. "On equivalence of scalar quantum electrodynamics via Duffin-Kemmer-Petiau and Klein-Gordon-Fock formalism using causal perturbation theory approach /." São Paulo, 2018. http://hdl.handle.net/11449/153869.
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Orientador: Bruto Max Pimentel EscobarBanca: Edmundo Capelas de Oliveira
Banca: Julio Marny Hoff da Silva
Banca: Pedro José Pompeia
Banca: Rodrigo Rocha Cuzinatto
Resumo: Nesta tese utilizamos a teoria de perturbação causal para estudar a eletrodinâmica quântica escalar com os campos de Duffin-Kemmer-Petiau. Determinamos as seções de choque diferenciais no nível da árvore, o tensor de polarização do vácuo, a função de auto energia e a renormalizabilidade da teoria. Depois disso, comparamos nossos resultados com os obtidos através dos campos de Klein-Gordon-Fock, determinando que eles não são completamente equivalentes
Abstract: In this Thesis we use causal perturbation theory to study scalar quantum electrodynamics with Duffin-Kemmer-Petiau fields. We determine the differential cross sections at the tree level, the vacuum polarization tensor, self energy function and the normalizability of the theory. After that, we compare our results with those ones obtained via Klein-Gordon-Fock fields determining that they are not completely equivalent
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Beltrán, Ramirez Jhosep Victorino. "On equivalence of scalar quantum electrodynamics via Duffin-Kemmer-Petiau and Klein-Gordon-Fock formalism using causal perturbation theory approach." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153869.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Nesta tese utilizamos a teoria de perturbação causal para estudar a eletrodinâmica quântica escalar com os campos de Duffin-Kemmer-Petiau. Determinamos as seções de choque diferenciais no nível da árvore, o tensor de polarização do vácuo, a função de auto energia e a renormalizabilidade da teoria. Depois disso, comparamos nossos resultados com os obtidos através dos campos de Klein-Gordon-Fock, determinando que eles não são completamente equivalentes
In this Thesis we use causal perturbation theory to study scalar quantum electrodynamics with Du n-Kemmer-Petiau elds. We determine the differential cross sections at the tree level, the vacuum polarization tensor, self energy function and the normalizability of the theory. After that, we compare our results with those ones obtained via Klein-Gordon-Fock elds determining that they are not completely equivalenttf
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Fukuda, Masahiro. "Theoretical Studies of Quantum Electrodynamics for Local Picture of Electron Spin and Time-evolution Simulation Method of Operators." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215962.
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Al-Awfi, Saud A. Gh. "Spontaneous emission and atom dynamics in planar and cylindrical structures." Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298835.
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Sundaram, Ganesh. "Wave-packet dynamics in slowly perturbed crystals : gradient corrections and Berry-phase effects /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
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Ringer, Ashley L. "From small to big." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28089.
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Thesis (M. S.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.Committee Chair: Sherrill, C. David; Committee Member: Bredas, Jean-Luc; Committee Member: El-Sayed, Mostafa A.; Committee Member: Harvey, Stephen C; Committee Member: Hernandez, Rigoberto.
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Khatiwada, Pawan. "An Introduction to Tensor Networks and Matrix Product States with Applications in Waveguide Quantum Electrodynamics." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1626968551365296.
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McBride, Patrick M. "The Effect of Polarization and InGaN Quantum Well Shape in Multiple Quantum Well Light Emitting Diode Heterostructures." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/822.
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Previous research in InGaN/GaN light emitting diodes (LEDs) employing semi-classical drift-diffusion models has used reduced polarization constants without much physical explanantion. This paper investigates possible physical explanations for this effective polarization reduction in InGaN LEDs through the use of the simulation software SiLENSe. One major problem of current LED simulations is the assumption of perfectly discrete transitions between the quantum well (QW) and blocking layers when experiments have shown this to not be the case. The In concentration profile within InGaN multiple quantum well (MQW) devices shows much smoother and delayed transitions indicative of indium diffusion and drift during common atomic deposition techniques (e.g. molecular beam epitaxy, chemical vapor deposition). In this case the InGaN square QW approximation may not be valid in modeling the devices' true electronic behavior. A simulation of a 3QW InGaN/GaN LED heterostructure with an AlGaN electron blocking layer is discussed in this paper. Polarization coefficients were reduced to 70% and 40% empirical values to simulate polarization shielding effects. QW shapes of square (3 nm), trapezoidal, and triangular profiles were used to simulate realistic QW shapes. The J-V characteristic and electron-hole wavefunctions of each device were monitored. Polarization reduction decreased the onset voltage from 4.0 V to 3.0 V while QW size reduction decreased the onset voltage from 4.0 V to 3.5 V. The increased current density in both cases can be attributed to increased wavefunction overlap in the QWs.
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Alston, Sam D. "Modern perturbative techniques applied to Yang-Mills and gravity theories." Thesis, Swansea University, 2013. https://cronfa.swan.ac.uk/Record/cronfa42943.
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Tauer, Anthony Philip. "Theorectical investigations of PI-PI AND Sulfur-PI interactions and their roles in biomolecluar systems." Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11282005-111222/.
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Thesis (M. S.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2006.Bredas, Jean-Luc, Committee Member ; Sherrill, C. David, Committee Chair ; Hernandez, Rigoberto, Committee Member.
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Tauer, Anthony Philip. "Theoretical Investigations of Pi-Pi and Sulfur-Pi Interactions and their Roles in Biomolecular Systems." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7573.
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The study of noncovalent interactions between aromatic rings and various functional groups is a very popular topic in current computational chemistry. The research presented in this thesis takes steps to bridge the gap between theoretical prototypes and real-world systems.
The non-additive contributions to the interaction energy in stacked aromatic systems are measured by expanding the prototype benzene dimer into trimeric and tetrameric systems. We show that the three- and four-body interaction terms generally do not contribute significantly to the overall interaction energy, and that the two-body terms are essentially the same as in the isolated dimer.
The sulfur-pi interaction is then studied by using the hydrogen sufide-benzene dimer as a prototype system for theoretical predictions. We obtain higly-accurate potential energy curves, as well as an interaction energy extrapolated to the complete basis set limit. Energy decomposition analysis using symmetry-adapted perturbation theory shows that the sulfur-pi interaction is primarily electrostatic in nature.
These theoretical results are then compared to an analysis of real sulfur-pi contacts found by searching protein structures in the Brookhaven Protein DataBank. We find that the most frequently seen configuration does not correspond to the theoretically predicted equilibrium for sydrogen sulfide-benzene, but instead to a configuration that suggests an alkyl-pi interaction involving the carbon adjacent to the sulfur atom. We believe our findings indicate that environmental effects within proteins are altering the energetics of the sulfur-pi interaction so that other functional groups are preferred for interacting with the aromatic ring.
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Nelson, Daniel Richard. "Partially Quenched Chiral Perturbation Theory and a Massless Up Quark: A Lattice Calculation of the Light-Quark-Mass Ratio." Connect to this title online, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1038343149.
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Thesis (Ph. D.)--Ohio State University, 2002.Title from first page of PDF file. Document formatted into pages; contains xxiii, 296 p.; also includes graphics (some col.) Includes bibliographical references (p. 293-296). Available online via OhioLINK's ETD Center
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Bird, Christopher Shane. "Infrared regularization in relativistic chiral perturbation theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://hdl.handle.net/1828/1062.
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Chiral perturbation theory is a useful tool in the study of low energy reactions involving light particles. However the inclusion of heavy particles in chiral perturbation theory results in large contributions from loop diagrams which violate the standard power counting scheme. We review two methods, referred to as heavy baryon chiral perturbation theory and infrared regularization, which remove the high energy effects of the heavy particles and which therefore do not violate the power counting scheme. We then use these two methods to calculate the amplitude for pion photoproduction to fourth order and prove that the two amplitudes are equivalent.
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Bashford, James Donald. "On a dynamical origin for fermion generations /." Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phb2998.pdf.
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Deliyanakis, Nicholas. "A study of tokamak energy and particle transport, based on modulated electron cyclotron resonance heating." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:b5426c92-b6ee-43fb-ad46-6fcb9ae9b4fe.
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A dynamical technique for the study of tokamak energy and particle transport has been developed. The plasma in the medium-sized DITE tokamak was perturbed by the application of modulated electron cyclotron resonance heating, with wave-launching from the high-field side. These experiments were carried out with absorption at various distances from the plasma centre, over a range of densities. Energy transport through the electron channel was dominant, and the variations in electron temperature and density were measured using the soft X-ray, electron cyclotron emission and microwave interferometer diagnostics. Analysis in the frequency domain enabled the propagation of the thermal wave to be followed. The observed behaviour was generally indicative of diffusive propagation of the thermal perturbation. Further observations indicated a modulation of the horizontal plasma shifts, diffusive propagation to the edge and a low modulation level of line-averaged density. In some atypical cases, the observed behaviour was qualitatively different; this type of behaviour was accompanied by a pronounced sawtooth oscillation locked with the modulation. Two models have been employed for the interpretation of these results. The first model, based on the diffusive thermal transport of the perturbation, has led to results in good agreement with the experimental data. Values of the electron thermal diffusivity were deduced, in good agreement with those obtained from the alternative techniques of power balance analysis and sawtooth heat pulse propagation analysis; such agreement has not been universally obtained in similar experiments. The width of the absorption region has emerged as an important consideration in this analysis. A more complex model, including non-linear, coupled equations of particle and energy balance, has produced results in partial agreement with the experimental data, supporting, to some extent, the presence of coupled transport. It has been demonstrated how perturbation techniques can afford a useful means of testing transport models.
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Aiello, Gianluca. "Quantum dynamics of a high impedance microwave cavity strongly coupled to a Josephson junction." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP089.
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Le but de cette thèse est d'étudier les propriétés et la dynamique d'une cavité micro-onde à haute impédance couplée galvaniquement à une jonction Josephson polarisée en tension. La cavité est réalisée en aluminium granulaire, un supraconducteur désordonné à haute inductance cinétique, qui nous a permis d'obtenir des modes avec un facteur de qualité élevé (jusqu'à 30 000) et une grande impédance caractéristique allant jusqu'à 5 kOhm dans la gamme du GHz. L'occupation et les propriétés des modes de la cavité sont fortement influencées par les processus tunnel se produisant dans la jonction connectée à la cavité. Comme l'impédance caractéristique des modes est comparable au quantum de résistance, des processus non linéaires d'ordre élevé sont observés. À basse tension par rapport au gap supraconducteur de la jonction, le processus dominant est le passage tunnel inélastique des paires de Cooper, qui peuple les différents modes de la cavité. Nous mesurons directement l'émission de photons dans un mode à 6 GHz et observons plus de 70 pics d'émission en fonction de la tension de polarisation, une signature claire de la non-linéarité élevée. Aux tensions plus élevées proches du gap, le tunneling des quasi-particules domine. Ce processus dissipatif modifie à la fois la fréquence de résonance et la largeur des modes. Un traitement quantique de ce processus dissipatif en termes de décalage de Lamb et de sauts quantiques est nécessaire pour expliquer quantitativement nos mesures. Ces résultats montrent le potentiel de l'aluminium granulaire pour réaliser des expériences d'optique quantique dans un régime où le transport de charge et les photons micro-ondes sont fortement couplésThe purpose of this thesis is to investigate the properties and the dynamics of a high impedance microwave cavity galvanically coupled to a DC biased Josephson junction. The cavity is realized in granular Aluminum, a disordered superconductor with high kinetic inductance, which allowed us to obtain modes with a high quality factor (up to 30000) and a large characteristic impedance up to 5 kOhm in the GHz range. The occupation and the properties of the cavity modes are strongly affected by the charge tunneling processes occurring in the junction connected to the cavity. Because the characteristic impedance of the modes is comparable to the quantum of resistance, high order non-linear processes are observed. At low voltages compared to the superconducting gap of the junction, the dominant process is the inelastic tunneling of Cooper pairs, which populates the different cavity modes. We directly measure the photon emission in one mode at 6 GHz and observe more than 70 emission peaks as a function of bias voltage, a clear signature of the high non-linearity. At larger voltages close to the gap, quasiparticle tunneling dominates. This dissipative process modifies both the resonance frequency and the linewidth of the modes. A quantum treatment of this dissipative process in terms of Lamb shift and quantum jumps is required to quantitatively explain our measurements. These results show the potential of granular Aluminum to realize microwave quantum optics experiments in a regime where charge transport and microwave photons are strongly coupled
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Costa, Lúcio Campos. "Estudo da violação das simetrias de Lorentz e CPT na eletrodinâmica quântica /." São Paulo : [s.n.], 2004. http://hdl.handle.net/11449/102501.
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Orientador: Jeferson de Lima TomazelliBanca: José Francisco Gomes
Banca: Maria Cristina Batoni Abdalla
Banca: Josif Frenkel
Banca: Tereza Cristina da Rocha Mendes
Resumo: Na presente tese, investiga-se uma versão estendida da eletrodinâmica quântica, onde se introduz um termo de acoplamento axial renormalizável não invariante, dando ênfase à quebra dinâmica das simetrias de Lorentz e CPT no setor de gauge e à ambigüidade no coeficiente do termo do tipo Chern-Simons, induzido através de correções radiativas e outros métodos não perturbativos. Aspectos da teoria efetiva de Euler-Kockel-Heisenberg a tempertura finita também são investigados à luz do formalismo conhecido como Thermo Field Dynamics.
Abstract: In the present thesis it is investigated an extended version of quantum electrodynamic where a renormalized non-invariant axial coupling term introduced, emphasizing the dynamic violation of the Lorentz and CPT symmetries in the gauge sector of the theory as well as the ambiguity of the coeficient of the Chern-Simon-like term, induced through radiative corrections and other non-perturbative methods. Some aspects of the Euler-Kockel-Heisenber effective theory at finite temperature have also been addressed in the context of the Thermo Field Dynamics formalism.
Doutor
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Manzoni, Luiz ALberto. "Teoria de perturbação causal para o modelo de Thirring como uma Teoria de "Gauge" /." São Paulo, 1999. http://hdl.handle.net/11449/132813.
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Chao, Chien-Hung. "Micro-operation perturbations in chip level fault modeling." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80061.
Full textAbstract:
In chip level testing using hardware description language approach, a difficult question to answer is: What is the best micro-operation perturbation for modeling fault at the chip level? In this thesis, an automatic evaluation system is developed to determine the best micro-operation perturbation. The measure used is the gate level stuck-at fault coverage achieved by the tests derived to cover the micro-operation perturbation faults. For small combinational circuits, it is shown that perturbing the elements into the logic dual is a good choice. For large combinational circuits, it is shown that there is very little variation in the gate level coverage achieved by the various microoperation faults. In this case, if coverage is to be improved, the micro-operation perturbation method must be augmented by other techniques.Master of Science
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Wu, Jackson M. S. "Improvement of Wilson fermions and twisted mass lattice QCD /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9706.
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Sinnokrot, Mutasem Omar. "Theoretical Investigations of pi-pi Interactions and Their Role in Molecular Recognition." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5019.
Full textAbstract:
Noncovalent interactions are of pivotal importance in many areas of chemistry, biology, and materials science, and the intermolecular interactions involving aromatic rings in particular, are fundamental to molecular organization and recognition processes. The work detailed in this thesis involves the application of state-of-the-art ab initio electronic structure theory methods to elucidate the nature of pi-pi interactions. The binding energies, and geometrical and orientational preferences of the simplest prototype of aromatic pi-pi interactions, the benzene dimer, are explored. We obtain the first converged values of the binding energies using highly accurate methods and large basis sets. Results from this study predict the T-shaped and parallel-displaced configurations of benzene dimer to be nearly isoenergetic.
The role of substituents in tuning pi-pi interaction is investigated. By studying dimers of benzene with various monosubstituted benzenes (in the sandwich and two T-shaped configurations), we surprisingly find that all of the substituted sandwich dimers considered bind more strongly than benzene dimer. We also find that these interactions can be tuned by a modest degree of substitution. Energy decomposition analysis using symmetry-adapted perturbation theory (SAPT) reveals that models based solely on electrostatic effects will have difficulty in reliably predicting substituent effects in pi-pi interactions.
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Gulez, Emel. "B meson semileptonic form factors using unquenched lattice QCD." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1155239314.
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Gogyan, Anahit. "Generation and interfacing of single-photon light with matter and control of ultrafast atomic dynamics for quantum information processing." Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00534488.
Full textAbstract:
We develop a robust and realistic mechanism for the generation of indistinguishable single-photon (SP) pulses with identical frequency and polarization. They are produced on demand from a coupled double-Raman atom-cavity system driven by a sequence of laser pump pulses. This scheme features a high efficiency, the ability to produce a sequence of narrow-band SP pulses with a delay determined only by the pump repetition rate, and simplicity of the system free from complications such as repumping process and environmental dephasing. We propose and analyze a simple scheme of parametric frequency conversion for optical quantum information in cold atomic ensembles. Its remarkable properties are minimal losses and distortion of the pulse shape, and the persistence of quantum coherence and entanglement. Efficient conversion of frequency between different spectral regions is shown. A method for the generation of frequency-entangled single photon states is discussed. We suggest a robust and simple mechanism for the coherent excitation of molecules or atoms to a superposition of pre-selected states by a train of femtosecond laser pulses, combined with narrow-band coupling field. The theory of quantum beatings in the generation of ultra-violet radiation via a four wave mixing in pump-probe experiments is developed. The results are in good agreement with experimental data observed in Rb vapor when the laser phase fluctuations are significant.
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Costa, Lúcio Campos [UNESP]. "Estudo da violação das simetrias de Lorentz e CPT na eletrodinâmica quântica." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/102501.
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Na presente tese, investiga-se uma versão estendida da eletrodinâmica quântica, onde se introduz um termo de acoplamento axial renormalizável não invariante, dando ênfase à quebra dinâmica das simetrias de Lorentz e CPT no setor de gauge e à ambigüidade no coeficiente do termo do tipo Chern-Simons, induzido através de correções radiativas e outros métodos não perturbativos. Aspectos da teoria efetiva de Euler-Kockel-Heisenberg a tempertura finita também são investigados à luz do formalismo conhecido como Thermo Field Dynamics.
In the present thesis it is investigated an extended version of quantum electrodynamic where a renormalized non-invariant axial coupling term introduced, emphasizing the dynamic violation of the Lorentz and CPT symmetries in the gauge sector of the theory as well as the ambiguity of the coeficient of the Chern-Simon-like term, induced through radiative corrections and other non-perturbative methods. Some aspects of the Euler-Kockel-Heisenber effective theory at finite temperature have also been addressed in the context of the Thermo Field Dynamics formalism.
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Jentschura, Ulrich. "Quantum Electrodynamic Bound-State Calculations and Large-Order Perturbation Theory. - (This manuscript is also available - in the form of a book - from Shaker Verlag GmbH, Postfach 101818, 52018 Aachen, Germany world-wide web address: http://www.shaker.de, electronic-mail address: info@shaker.de. It has been posted on the web sites of Dresden University of Technology with the permission of the publisher.)." Doctoral thesis, Technische Universität Dresden, 2002. https://tud.qucosa.de/id/qucosa%3A24235.
Full textAbstract:
The accurate calculation of atomic spectra, including radiative corrections, is one of the rather challenging tasks in theoretical physics. The entire formalism of quantum (gauge) field theory, augmented by the difficulties of the bound-state formalism, is needed for an accurate understanding of the relevant physics at the level of current high-precision spectroscopy. In this thesis, several calculations in this area are described in detail. Investigations on large-order perturbation-theory effects (and predictive limits of perturbation theory) supplement these investigations. In the context of applications, numerical algorithms for the acceleration of the convergence of series are discussed.
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Jentschura, Ulrich. "Quantum Electrodynamic Bound-State Calculations and Large-Order Perturbation Theory. - (This manuscript is also available - in the form of a book - from Shaker Verlag GmbH, Postfach 101818, 52018 Aachen, Germany world-wide web address: http://www.shaker.de, electronic-mail address: info@shaker.de. It has been posted on the web sites of Dresden University of Technology with the permission of the publisher.)." Aachen : Shaker, 2003. http://deposit.d-nb.de/cgi-bin/dokserv?idn=968750435.
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Huang, Meng-Zi. "Spin squeezing and spin dynamics in a trapped-atom clock." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS134.
Full textAbstract:
Les capteurs atomiques sont un outil de référence pour les mesures de précision du temps, des champs électriques et magnétiques et des forces d'inertie. Cependant, en absence d’une corrélation quantique entre atomes, le bruit de projection quantique constitue une limite fondamentale pour ces capteurs, appelée la limite quantique standard (SQL). Les meilleures horloges actuelles ont déjà atteint cette limite. Cependant, elle peut être surmonté en utilisant l’intrication quantique, dans un état comprimé de spin notamment. Ce dernier peut être crée par mesure quantique non-destructive (QND), en particulier dans le cadre de l’électrodynamique quantique en cavité (cQED). Dans cette thèse, je présente la deuxième génération de l'horloge à atomes piégés sur puce TACC, dans laquelle nous combinons une horloge atomique compacte avec une plateforme cQED miniature pour tester les protocoles de métrologie quantique à un niveau de précision métrologique. Dans une mesure Ramsey standard, nous mesurons une stabilité de 6E-13 à 1 s. Nous démontrons la compression de spin par mesure QND, atteignant 8(1) dB pour 1.7E4 atomes, limitée actuellement par la décohérence due au bruit technique. Les collisions entre atomes froids jouent un rôle important à ce niveau de précision, donnant lieu à une riche dynamique de spin. Nous constatons que l’interaction entre mesures par la cavité et dynamique collisionnelle de spin se manifeste dans un effet d'amplification du signal de la cavité. Un modèle simple est proposé et confirmé par des mesures préliminaires. De nouvelles expériences sont proposés pour éclairer davantage la physique à N corps surprenante dans ce système d'atomes froidsAtomic sensors are among the best devices for precision measurements of time, electric and magnetic fields, and inertial forces. However, all atomic sensors that utilise uncorrelated particles are ultimately limited by quantum projection noise, as is already the case for state-of-the-art atomic clocks. This so-called standard quantum limit (SQL) can be overcome by employing entanglement, a prime example being the spin-squeezed states. Spin squeezing can be produced in a quantum non-demolition (QND) measurement of the collective spin, particularly with cavity quantum electrodynamical (cQED) interactions. In this thesis, I present the second-generation trapped-atom clock on a chip (TACC) experiment, where we combine a metrology-grade compact clock with a miniature cQED platform to test quantum metrology protocols at a metrologically-relevant precision level. In a standard Ramsey spectroscopy, the stability of the apparatus is confirmed by a fractional frequency Allan deviation of 6E-13 at 1 s. We demonstrate spin squeezing by QND measurement, reaching 8(1) dB for 1.7E4 atoms, currently limited by decoherence due to technical noise. Cold collisions between atoms play an important role at this level of precision, leading to rich spin dynamics. Here we find that the interplay between cavity measurements and collisional spin dynamics manifests itself in a quantum amplification effect of the cavity measurement. A simple model is proposed, and is confirmed by initial measurements. New experiments in this direction may shed light on the surprising many-body physics in this sytem of interacting cold atoms
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Mondal, Ritwik. "Relativistic theory of laser-induced magnetization dynamics." Doctoral thesis, Uppsala universitet, Materialteori, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-315247.
Full textAbstract:
Ultrafast dynamical processes in magnetic systems have become the subject of intense research during the last two decades, initiated by the pioneering discovery of femtosecond laser-induced demagnetization in nickel. In this thesis, we develop theory for fast and ultrafast magnetization dynamics. In particular, we build relativistic theory to explain the magnetization dynamics observed at short timescales in pump-probe magneto-optical experiments and compute from first-principles the coherent laser-induced magnetization. In the developed relativistic theory, we start from the fundamental Dirac-Kohn-Sham equation that includes all relativistic effects related to spin and orbital magnetism as well as the magnetic exchange interaction and any external electromagnetic field. As it describes both particle and antiparticle, a separation between them is sought because we focus on low-energy excitations within the particle system. Doing so, we derive the extended Pauli Hamiltonian that captures all relativistic contributions in first order; the most significant one is the full spin-orbit interaction (gauge invariant and Hermitian). Noteworthy, we find that this relativistic framework explains a wide range of dynamical magnetic phenomena. To mention, (i) we show that the phenomenological Landau-Lifshitz-Gilbert equation of spin dynamics can be rigorously obtained from the Dirac-Kohn-Sham equation and we derive an exact expression for the tensorial Gilbert damping. (ii) We derive, from the gauge-invariant part of the spin-orbit interaction, the existence of a relativistic interaction that linearly couples the angular momentum of the electromagnetic field and the electron spin. We show this spin-photon interaction to provide the previously unknown origin of the angular magneto-electric coupling, to explain coherent ultrafast magnetism, and to lead to a new torque, the optical spin-orbit torque. (iii) We derive a definite description of magnetic inertia (spin nutation) in ultrafast magnetization dynamics and show that it is a higher-order spin-orbit effect. (iv) We develop a unified theory of magnetization dynamics that includes spin currents and show that the nonrelativistic spin currents naturally lead to the current-induced spin-transfer torques, whereas the relativistic spin currents lead to spin-orbit torques. (v) Using the relativistic framework together with ab initio magneto-optical calculations we show that relativistic laser-induced spin-flip transitions do not explain the measured large laser-induced demagnetization. Employing the ab initio relativistic framework, we calculate the amount of magnetization that can be imparted in a material by means of circularly polarized light – the so-called inverse Faraday effect. We show the existence of both spin and orbital induced magnetizations, which surprisingly reveal a different behavior. We establish that the laser-induced magnetization is antisymmetric in the light’s helicity for nonmagnets, antiferromagnets and paramagnets; however, it is only asymmetric for ferromagnets.
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Khan, Abdul Kareem. "Electrostaticanalisys the Ras active site." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7161.
Full textAbstract:
La preorganització electrostàtica del centre actiu s'ha postulat com el mecanisme genèric de l'acció dels enzims. Així, alguns residus "estratègics" es disposarien per catalitzar reaccions interaccionant en una forma més forta amb l'estat de transició, baixant d'aquesta manera el valor de l'energia dactivació g cat. S'ha proposat que aquesta preorientació electrostática s'hauria de poder mostrar analitzant l'estabilitat electrostàtica de residus individuals en el centre actiu.Ras es una proteïna essencial de senyalització i actúa com un interruptor cel.lular. Les característiques estructurals de Ras en el seu estat actiu (ON) són diferents de les que té a l'estat inactiu (OFF). En aquesta tesi es duu a terme una anàlisi exhaustiva de l'estabilitat dels residus del centre actiu deRas en l'estat actiu i inactiu.
The electrostatic preorganization of the active site has been put forward as the general framework of action of enzymes. Thus, enzymes would position "strategic" residues in such a way to be prepared to catalyze reactions by
interacting in a stronger way with the transition state, in this way decreasing the activation energy g cat for the catalytic process. It has been proposed that
such electrostatic preorientation should be shown by analyzing the electrostatic stability of individual residues in the active site.
Ras protein is an essential signaling molecule and functions as a switch in the
cell. The structural features of the Ras protein in its active state (ON state) are different than those in its inactive state (OFF state). In this thesis, an exhaustive analysis of the stability of residues in the active and inactive Ras active site is performed.
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Tjiang, Paulus Cahyono. "Gauge covariance and fermion-photon vertex in massless quantum electrodynamics." Phd thesis, 1999. http://hdl.handle.net/1885/147626.
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Deng, Jia. "Perturbation theory in quantum chemistry." Phd thesis, 2012. http://hdl.handle.net/1885/150796.
Full textAbstract:
This thesis is chiefly concerned with the development of cost-effective approximations to established quantum chemistry methods in terms of perturbative corrections. The central idea involves the use of low-quality calculations as a spring-board to their high-quality, but computationally demanding counterparts. The idea is applied to Self-Consistent Field and second-order M{u00F8}ller-Plesset Perturbation Theory calculations and the performance is thoroughly assessed. Results indicate that, because remarkable agreement with exact calculations can be obtained at drastically reduced cost, these perturbative corrections offer an attractive alternative to exact calculations and allow larger systems to be studied. In addition, the thesis describes two extensions of perturbative corrections in the context of orbital diagnostics and dual-basis counterpoise corrections, which both have useful practical utilities.
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"Time evolution of perturbed quantum mechanical morse oscillator =: 被擾動的Morse諧振子在量子力學中的演化." 2002. http://library.cuhk.edu.hk/record=b5895993.
Full textAbstract:
Yuen Pui-Ho.Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.
Includes bibliographical references (leaves 158-159).
Text in English; abstracts in English and Chinese.
Yuen Pui-Ho.
ACKNOWLEDGEMENTS --- p.1
ABSTRACT --- p.2
CONTENTS --- p.4
LIST OF FIGURES --- p.7
Chapter CHAPTER 1 - --- INTRODUCTION --- p.13
Chapter 1-1 --- Interaction with EM-field --- p.15
Chapter 1-2 --- Objective of this study --- p.17
Chapter 1-3 --- Thesis arrangement --- p.18
Chapter CHAPTER 2 - --- LITERATURE REVIEW --- p.20
Chapter 2-1 --- Numerical Method --- p.20
Chapter 2-1-1 --- Classical calculation --- p.20
Chapter 2-1-2 --- Quantum mechanical calculation --- p.21
Chapter 2-1-2-1 --- Finite Difference Method --- p.21
Chapter 2-1-2-2 --- Non-finite difference method --- p.23
Chapter 2-1-3 --- Calculation of dissociation probability --- p.24
Chapter 2-2 --- Morse oscillator under constant driving frequency --- p.26
Chapter 2-2-1 --- Classical and quantum dynamics comparison --- p.26
Chapter 2-2-2 --- Resonance condition and factors affecting dissociation probability --- p.27
Chapter 2-3 --- MORSE OSCILLATOR UNDER CHIRPED DRIVING FREQUENCY --- p.33
Chapter 2-3-1 --- Bucket Dynamics --- p.35
Chapter 2-3-2 --- Floquet Analysis --- p.38
Chapter 2-4 --- Summaries --- p.43
Chapter CHAPTER 3 - --- METHODOLOGY --- p.46
Chapter 3-1 --- The model --- p.46
Chapter 3-2 --- An approximation to sinusoidal variation --- p.47
Chapter 3-3 --- Approximation to chirping frequency --- p.51
Chapter 3-4 --- Calculating time evolution operator for piecewise constant --- p.56
Chapter 3-5 --- Performance of the piecewise constant approach --- p.58
Chapter 3-5-1 --- Error vs. time --- p.59
Chapter 3-5-2 --- Accuracy dependence on number of term included --- p.62
Chapter 3-5-3 --- Accuracy dependence on applied E-field --- p.64
Chapter 3-5-4 --- "Drawbacks of the "" piecewise constant approach ´ح" --- p.65
Chapter CHAPTER 4 - --- BEHAVIOR OF MORSE OSCILLATOR UNDER SEMI-CLASSICAL EM- FIELD --- p.67
Chapter 4-1 --- Morse oscillator in monochromatic laser light --- p.67
Chapter 4-1-1 --- Theoretical analysis --- p.67
Chapter 4-1-2 --- Numerical simulation --- p.70
Chapter 4-1-2-1 --- Dependence on resonant levels --- p.70
Chapter 4-1-2-2 --- Dependence on Intensity --- p.76
Chapter 4-1-2-3 --- Frequency deviation from resonant frequency --- p.79
Chapter 4-2 --- Morse oscillator driven by chirped laser pulse --- p.89
Chapter 4-2-1 --- Chirping scheme --- p.89
Chapter 4-2-2 --- Level climbing and residual --- p.92
Chapter 4-2-3 --- Factors affecting dissociation probability --- p.98
Chapter 4-2-3-1 --- Dependence on driving amplitude --- p.98
Chapter 4-2-3-2 --- Dependence on rate of frequency change and initial driving frequency --- p.99
Chapter 4-2-3-3 --- Dependency on starting state --- p.104
Chapter 4-3 --- Chapter Summary --- p.106
Chapter CHAPTER 5 - --- "BUCKET DYNAMICS AND QUANTUM MECHANICAL ""PHASE SPACE""" --- p.108
Chapter 5-1 --- Bucket dynamics in classical Morse oscillator --- p.109
Chapter 5-2 --- "Quantum mechanical ""phase space""" --- p.114
Chapter 5-2-1 --- Wigner function and its properties --- p.115
Chapter 5-2-2 --- Q-function and its properties --- p.121
Chapter 5-2-3 --- Q-functions of the energy eigenstates of Morse oscillator --- p.123
Chapter 5-3 --- Evolution of Wigner function and Q-function --- p.125
Chapter 5-3-1 --- Evolution of Wigner function and Q-function under periodic driving field --- p.125
Chapter 5-3-2 --- Evolution of Wigner function and Q-function under driving field with chirped frequency --- p.132
Chapter 5-4 --- "Bucket dynamics and, quantum mechanical ""phase space""" --- p.138
Chapter 5-5 --- Chapter Summary --- p.141
Chapter CHAPTER 6 - --- CONCLUSIONS AND FURTHER STUDIES --- p.143
Chapter 6-1 --- Morse oscillator driven by monochromic laser light --- p.143
Chapter 6-1-1 --- Factors affecting the behavior of Morse oscillator in monochromic laser light --- p.144
Chapter 6-1-1-1 --- Effect of laser intensity --- p.144
Chapter 6-1-1-2 --- Effect of driving frequency --- p.144
Chapter 6-2 --- Morse oscillator driven by chirped laser pulse --- p.145
Chapter 6-3 --- "Bucket dynamics and quantum mechanical ""phase space""" --- p.146
Chapter 6-4 --- Wigner function and Q-function of driven Morse oscillator --- p.147
Chapter 6-5 --- Conclusions and Discussions --- p.149
APPENDIX A - EQUIVALENCE OF QUANTUM SYSTEMS WITH DIFFERENT GAUGES --- p.150
APPENDIX B - CALCULATION OF TRANSITION MATRIX ELEMENT TMN --- p.152
"APPENDIX C - CALCULATION OF PERTURBED MATRIX ELEMENTS, H´ةKN" --- p.154
BIBLIOGRAPHY --- p.158
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"Properties of strange stars." 2003. http://library.cuhk.edu.hk/record=b5891677.
Full textAbstract:
Wong Ka Wah = 奇異星的特性 / 黃嘉華.Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.
Includes bibliographical references (leaves 98-101).
Text in English; abstracts in English and Chinese.
Wong Ka Wah = Qi yi xing de te xing / Huang Jiahua.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- History of Compact Stars --- p.1
Chapter 1.2 --- The Proposal of Strange Quark Stars --- p.2
Chapter 1.3 --- Outline of the Thesis --- p.3
Chapter 2 --- Cold Equation of State from Perturbative QCD --- p.6
Chapter 2.1 --- Description of Strange Quark Matter --- p.7
Chapter 2.2 --- MIT Bag Model --- p.8
Chapter 2.3 --- Perturbative QCD --- p.10
Chapter 2.4 --- Comparison with MIT Bag Model --- p.11
Chapter 3 --- Static Structure of Strange Stars --- p.16
Chapter 3.1 --- Static Equilibrium --- p.16
Chapter 3.2 --- Models --- p.18
Chapter 3.3 --- Results of Global Properties and Discussions --- p.18
Chapter 4 --- Stability of Strange Quark Matter --- p.25
Chapter 4.1 --- Absolute Stable Condition --- p.25
Chapter 4.2 --- Weak Stable Condition --- p.26
Chapter 4.3 --- Stability Condition Compared to Neutron Stars --- p.27
Chapter 4.4 --- Conclusion --- p.28
Chapter 5 --- Effect of Massive Strange Quarks --- p.31
Chapter 5.1 --- Numerical Analysis of the Effect of Strange Quark Mass on the EOS --- p.33
Chapter 5.2 --- Structure of Strange Stars with Strange Quark Mass --- p.37
Chapter 5.3 --- Conclusion --- p.38
Chapter 6 --- QCD Phase Transition in a Compact Star --- p.46
Chapter 6.1 --- Cooling Properties --- p.47
Chapter 6.1.1 --- Heat capacity of quark stars --- p.49
Chapter 6.1.2 --- Luminosity of quark stars --- p.50
Chapter 6.1.3 --- Microphysics of the neutron star cooling --- p.54
Chapter 6.2 --- Handling of the Phase Transition --- p.56
Chapter 6.3 --- The Models --- p.59
Chapter 6.4 --- Results --- p.60
Chapter 6.4.1 --- Method 1 --- p.61
Chapter 6.4.2 --- Method 2 --- p.66
Chapter 6.5 --- Discussion and Conclusion --- p.66
Chapter 7 --- Formation of a Strange Star --- p.73
Chapter 7.1 --- Formalism of the Problem --- p.73
Chapter 7.2 --- Lagrangian Hydrodynamics --- p.74
Chapter 7.3 --- Hot Equation of State --- p.75
Chapter 7.3.1 --- Nuclear Matter EOS --- p.75
Chapter 7.3.2 --- Quark Matter EOS --- p.77
Chapter 7.3.3 --- Mixed Phase --- p.78
Chapter 7.4 --- Initial Models --- p.78
Chapter 7.5 --- Results --- p.80
Chapter 7.6 --- Discussion and Conclusion --- p.81
Chapter 8 --- Conclusion --- p.95
Bibliography --- p.98
Chapter A --- Solving the EOS --- p.102
Chapter B --- Solving C from Eq. (7.10) --- p.105
48
"Properties of quasinormal modes in open systems." Chinese University of Hong Kong, 1995. http://library.cuhk.edu.hk/record=b5888332.
Full textAbstract:
by Tong Shiu Sing Dominic.Parallel title in Chinese characters.
Thesis (Ph.D.)--Chinese University of Hong Kong, 1995.
Includes bibliographical references (leaves 236-241).
Acknowledgements --- p.iv
Abstract --- p.v
Chapter 1 --- Open Systems and Quasinormal Modes --- p.1
Chapter 1.1 --- Introduction --- p.1
Chapter 1.1.1 --- Non-Hermitian Systems --- p.1
Chapter 1.1.2 --- Optical Cavities as Open Systems --- p.3
Chapter 1.1.3 --- Outline of this Thesis --- p.6
Chapter 1.2 --- Simple Models of Open Systems --- p.10
Chapter 1.3 --- Contributions of the Author --- p.14
Chapter 2 --- Completeness and Orthogonality --- p.16
Chapter 2.1 --- Introduction --- p.16
Chapter 2.2 --- Green's Function of the Open System --- p.19
Chapter 2.3 --- High Frequency Behaviour of the Green's Function --- p.24
Chapter 2.4 --- Completeness of Quasinormal Modes --- p.29
Chapter 2. 5 --- Method of Projection --- p.31
Chapter 2.5.1 --- Problems with the Usual Method of Projection --- p.31
Chapter 2.5.2 --- Modified Method of Projection --- p.33
Chapter 2.6 --- Uniqueness of Representation --- p.38
Chapter 2.7 --- Definition of Inner Product and Quasi-Stationary States --- p.39
Chapter 2.7.1 --- Orthogonal Relation of Quasinormal Modes --- p.39
Chapter 2.7.2 --- Definition of Hilbert Space and State Vectors --- p.41
Chapter 2.8 --- Hermitian Limits --- p.43
Chapter 2.9 --- Numerical Examples --- p.45
Chapter 3 --- Time-Independent Perturbation --- p.58
Chapter 3.1 --- Introduction --- p.58
Chapter 3.2 --- Formalism --- p.60
Chapter 3.2.1 --- Expansion of the Perturbed Quasi-Stationary States --- p.60
Chapter 3.2.2 --- Formal Solution --- p.62
Chapter 3.2.3 --- Perturbative Series --- p.66
Chapter 3.3 --- Diagrammatic Perturbation --- p.70
Chapter 3.3.1 --- Series Representation of the Green's Function --- p.70
Chapter 3.3.2 --- Eigenfrequencies --- p.73
Chapter 3.3.3 --- Eigenfunctions --- p.75
Chapter 3.4 --- Numerical Examples --- p.77
Chapter 4 --- Method of Diagonization --- p.81
Chapter 4.1 --- Introduction --- p.81
Chapter 4.2 --- Formalism --- p.82
Chapter 4.2.1 --- Matrix Equation with Non-unique Solution --- p.82
Chapter 4.2.2 --- Matrix Equation with a Unique Solution --- p.88
Chapter 4.3 --- Numerical Examples --- p.91
Chapter 5 --- Evolution of the Open System --- p.97
Chapter 5.1 --- Introduction --- p.97
Chapter 5.2 --- Evolution with Arbitrary Initial Conditions --- p.99
Chapter 5.3 --- Evolution with the Outgoing Plane Wave Condition --- p.106
Chapter 5.3.1 --- Evolution Inside the Cavity --- p.106
Chapter 5.3.2 --- Evolution Outside the Cavity --- p.110
Chapter 5.4 --- Physical Implications --- p.112
Chapter 6 --- Time-Dependent Perturbation --- p.114
Chapter 6.1 --- Introduction --- p.114
Chapter 6.2 --- Inhomogeneous Wave Equation --- p.117
Chapter 6.3 --- Perturbative Scheme --- p.120
Chapter 6.4 --- Energy Changes due to the Perturbation --- p.128
Chapter 6.5 --- Numerical Examples --- p.131
Chapter 7 --- Adiabatic Approximation --- p.150
Chapter 7.1 --- Introduction --- p.150
Chapter 7.2 --- The Effect of a Varying Refractive Index --- p.153
Chapter 7.3 --- Adiabatic Expansion --- p.156
Chapter 7.4 --- Numerical Examples --- p.167
Chapter 8 --- Generalization of the Formalism --- p.176
Chapter 8. 1 --- Introduction --- p.176
Chapter 8.2 --- Generalization of the Orthogonal Relation --- p.180
Chapter 8.3 --- Evolution with the Outgong Wave Condition --- p.183
Chapter 8.4 --- Uniform Convergence of the Series Representation --- p.193
Chapter 8.5 --- Uniqueness of Representation --- p.200
Chapter 8.6 --- Generalization of Standard Calculations --- p.202
Chapter 8.6.1 --- Time-Independent Perturbation --- p.203
Chapter 8.6.2 --- Method of Diagonization --- p.206
Chapter 8.6.3 --- Remarks on Dynamical Calculations --- p.208
Appendix A --- p.209
Appendix B --- p.213
Appendix C --- p.225
Appendix D --- p.231
Appendix E --- p.234
References --- p.236
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Fetherolf, Jonathan Holmes. "Dynamics and spectroscopy of strongly coupled electrons and nuclei." Thesis, 2021. https://doi.org/10.7916/d8-m7a2-5119.
Full textAbstract:
This thesis describes work on several research topics in which transport and spectroscopy are influenced by strong electron-nuclear or nuclear-nuclear interactions. First, I give a broad overview of the motivations and background for the main topics covered in this thesis. In the next section, I explore the applicability of perturbative quantum master equations to linear absorption and nonlinear two-dimensional and pump-probe spectroscopies. Next, I introduce a theory of charge transport in organic semiconductors that unifies two popular pictures: incoherent polaron hopping and transient localization due to dynamic disorder. In the next section, I investigate the impact of phonon anharmonicity on the charge transport dynamics of soft semiconductors. Finally, I present a new method of efficiently calculating anharmonic vibrational spectra from ab initio molecular potential energy surfaces.
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Kreye, Manuel. "A Unitary Perturbation Theory Approach to Real-Time Evolution in the Hubbard Model." Doctoral thesis, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0005-128A-B.
Full text