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Dellby, Niklas. "Nonperturbative QCD calculations". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32656.
Pełny tekst źródłaDasgupta, T. "Instabilities in nonperturbative string theory". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598293.
Pełny tekst źródłaDetmold, William. "Nonperturbative approaches to quantum chromodynamics". Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phd4817.pdf.
Pełny tekst źródłaMazur, Daniel Paul. "Nonperturbative quantum field theory in astrophysics". Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43255.
Pełny tekst źródłaThomas, Lori Ann. "Nonperturbative solutions to the Hubbard Model". DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1987. http://digitalcommons.auctr.edu/dissertations/1179.
Pełny tekst źródłaGentles, Andrew James. "Nonperturbative propagators in axial gauge QCD". Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243921.
Pełny tekst źródłaFilippov, Igor Vladimirovich. "Nonperturbative numerical analysis of SY M₁₊₁ /". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486461246817281.
Pełny tekst źródłaEssafi, Karim. "Nonperturbative renormalization group approach to polymerized membranes". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00828639.
Pełny tekst źródłaSanielevici, S. (Sergiu). "Phenomenological implications of calculations in nonperturbative QCD". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74001.
Pełny tekst źródłaBurda, Philipp. "Nonperturbative aspects of gravity and field theory". Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11366/.
Pełny tekst źródłaSprague, Kevin B. "Investigations and techniques in nonperturbative quantum field theory". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/NQ42553.pdf.
Pełny tekst źródłaFlorea, B. "Singularities and nonperturbative string vacua with N=1 supersymmetry". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249388.
Pełny tekst źródłaGill, James Fenton. "Nonperturbative effects in the semileptonic decays of pseudoscalar mesons". Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/14910.
Pełny tekst źródłaMurugan, Jeffrey. "Geometrical and nonperturbative aspects of low dimensional field theories". Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/7681.
Pełny tekst źródłaWe present a collection of results on solitons in low-dimensional classical field theory. We begin by reviewing the geometrical setting of he nonlinear ơ-model and demonstrate the integrability of the theory in two-dimensions on a symmetric target manifold. After reviewing the construction of soliton solutions in the 0(3) ơ-model we consider a class of gauged nonlinear ơ-models on two-dimensional axially-symmetric target spaces. We show that, for a certain choice of self-interaction, these models are all self-dual and analyze the resulting Bogomol'nyi equations in the BPS limit using techniques from dynamical systems theory. Our analysis is then extended to topologically massive gauge fields. We conclude with a deviation into exploring links between four-dimensional self-dual Yang-Mills equations and various lower-dimensional field theories. In particular, we show that at the level of equations of motion, the Euclidean Yang-Mills equations in light-cone coordinates reduce to the two-dimensional nonlinear ơ-model.
Matsuo, Yoshinori. "Nonperturbative effects in noncritical string theory and matrix models". 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136767.
Pełny tekst źródłaVolkholz, Jan. "Nonperturbative studies of quantum field theories on noncommutative spaces". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2007. http://dx.doi.org/10.18452/15712.
Pełny tekst źródłaThis work deals with three quantum field theories on spaces with noncommuting position operators. Noncommutative models occur in the study of string theories and quantum gravity. They usually elude treatment beyond the perturbative level. Due to the technique of dimensional reduction, however, we are able to investigate these theories nonperturbatively. This entails translating the action functionals into a matrix language, which is suitable for numerical simulations. First we explore a scalar model on a noncommutative plane. We investigate the continuum limit at fixed noncommutativity, which is known as the double scaling limit. Here we focus especially on the fate of the striped phase, a phase peculiar to the noncommutative version of the regularized scalar model. We find no evidence for its existence in the double scaling limit. Next we examine the U(1) gauge theory on a four-dimensional spacetime, where two spatial directions are noncommutative. We examine the phase structure and find a new phase with a spontaneously broken translation symmetry. In addition we demonstrate the existence of a finite double scaling limit which confirms the renormalizability of the theory. Furthermore we investigate the dispersion relation of the photon. In the weak coupling phase our results are consistent with an infrared instability predicted by perturbation theory. If the translational symmetry is broken, however, we find a dispersion relation corresponding to a massless particle. Finally, we investigate a supersymmetric theory on the fuzzy sphere, which features scalar neutral bosons and Majorana fermions. The supersymmetry is exact in the limit of infinitely large matrices. We investigate the phase structure of the model and find three distinct phases. Summarizing, we study noncommutative field theories beyond perturbation theory. Moreover, we simulate a supersymmetric theory on the fuzzy sphere, which might provide an alternative to attempted lattice formulations.
Jurke, Benjamin. "Nonperturbative Type IIB Model Building in the F-Theory Framework". Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-127722.
Pełny tekst źródłaRoux, Filippus Stefanus. "Nonperturbative formation of fermion 2-point and 4-point functions". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ53841.pdf.
Pełny tekst źródłaElliott, Joshua. "Nonperturbative regulators for supersymmetric theories in 3 and 4 dimensions". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32279.
Pełny tekst źródłaNous montrons que les obstacles fondamentaux des simulations de différents domaines théoretiqe de champs supersymétriques de 3 et 4 dimensions avec Régularisation sur réseau peuvent être surmonté avec méthodes établies, et nous fournissons des procèdures dètaillées pour le théorie N=1 Super-Yang-Mills en 3 dimensions et N=4 Super-Yang-Mills en 4 dimensions. Nous décrivons, avec diffèrents niveaux de détail, les généralisations à divers autres thèories de 3 et 4D, et nous analysons un approche de réseau supersymétrie: discrétisation d'une torsion topologique de Super-Yang-Mills dans 2 et 4 dimensions.
Blum, Thomas Charles. "Nonperturbative quark mass and coupling renormalization in two flavor QCD". Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187168.
Pełny tekst źródłaPaulus, Timo. "Soft diffractive high energy scattering and form factors in nonperturbative QCD". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966005023.
Pełny tekst źródłaErlich, Joshua. "Aspects of the nonperturbative dynamics of supersymmetric gauge theories and strings". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/84756.
Pełny tekst źródłaWalsh, Dominic Anthony. "A nonperturbative study of three dimensional quantum electrodynamics with N flavours of fermion". Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6046/.
Pełny tekst źródłaChaurasia, Shikha. "Beyond the Standard Model: Flavor Symmetry, Nonperturbative Unification, Quantum Gravity, and Dark Matter". W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563898980.
Pełny tekst źródłaGuilleux, Maxime. "The nonperturbative renormalization group for quantum field theory in de De Sitter space". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC141/document.
Pełny tekst źródłaThe nonperturbative renormalization group for quantum field theory in de Sitter space.The study of cosmology draws us to the topic of quantum fields in curved space-time. In particular, light scalar fields offer a simple mechanism for inflation and primordial fluctuations. When computing loop corrections to these models however, infrared and secular divergences appear which call for resummation techniques. To this end, we implement the nonperturbative renormalization group for quantum scalar fields on a fixed de Sitter background. First, the Local Potential Approximation (LPA) is applied. We show that there is always symmetry restoration due to infrared effects, and that mass is generated in agreement with the stochastic approach. Next, we study the flat space limit of our formalism by taking the curvature $H\to0$, and we check that it reproduces a number of known results. Finally, we discuss the derivative expansion, which goes beyond the LPA. Its implementation seems too complex in general curved space-times, but de Sitter symmetries allow for a simpler representation. We define a prescription for all orders of the expansion, and discuss the flow of the first order term in the simple case where we neglect the field dependency (LPA')
Xue, Ying. "Quantum field-theoretical investigations in nonperturbative QCD and beyond-the-standard-model electroweak physics". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0012/NQ31168.pdf.
Pełny tekst źródłaTigg, Jason. "Nonperturbative techniques and the operator product expansion in studies of dynamically broken chiral symmetry". Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359504.
Pełny tekst źródłaSulejmanpašić, Tin [Verfasser], Falk [Akademischer Betreuer] Bruckmann i Tilo [Akademischer Betreuer] Wettig. "Nonperturbative physics, fractional instantons and matter fields / Tin Sulejmanpašić. Betreuer: Falk Bruckmann ; Tilo Wettig". Regensburg : Universitätsbibliothek Regensburg, 2014. http://d-nb.info/1054802718/34.
Pełny tekst źródłaYu, Ji-Young. "Neutrino interactions and nuclear effects in oscillation experiments and the nonperturbative dispersive sector in strong (quasi-) Abelian fields". [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964757303.
Pełny tekst źródłaChatrchyan, Aleksandr [Verfasser], i Jürgen [Akademischer Betreuer] Berges. "Nonperturbative dynamics in the early universe: from axion-like particles to dark matter and condensates / Aleksandr Chatrchyan ; Betreuer: Jürgen Berges". Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1215758200/34.
Pełny tekst źródłaMenon, Shakti Narayana. "Bifurcation problems in chaotically stirred reaction-diffusion systems". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3685.
Pełny tekst źródłaMenon, Shakti Narayana. "Bifurcation problems in chaotically stirred reaction-diffusion systems". University of Sydney, 2008. http://hdl.handle.net/2123/3685.
Pełny tekst źródłaA detailed theoretical and numerical investigation of the behaviour of reactive systems under the influence of chaotic stirring is presented. These systems exhibit stationary solutions arising from the balance between chaotic advection and diffusion. Excessive stirring of such systems results in the termination of the reaction via a saddle-node bifurcation. The solution behaviour of these systems is analytically described using a recently developed nonperturbative, non-asymptotic variational method. This method involves fitting appropriate parameterised test functions to the solution, and also allows us to describe the bifurcations of these systems. This method is tested against numerical results obtained using a reduced one-dimensional reaction-advection-diffusion model. Four one- and two-component reactive systems with multiple homogeneous steady-states are analysed, namely autocatalytic, bistable, excitable and combustion systems. In addition to the generic stirring-induced saddle-node bifurcation, a rich and complex bifurcation scenario is observed in the excitable system. This includes a previously unreported region of bistability characterised by a hysteresis loop, a supercritical Hopf bifurcation and a saddle-node bifurcation arising from propagation failure. Results obtained with the nonperturbative method provide a good description of the bifurcations and solution behaviour in the various regimes of these chaotically stirred reaction-diffusion systems.
Aguirre, John David Gómez. "Consequences of a dynamical gluon mass". reponame:Repositório Institucional da UFABC, 2017.
Znajdź pełny tekst źródłaTese (doutorado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2017.
Na literatura encontramos argumentos tanto fenomenológicos quanto teóricos que favorecem o congelamento da constante de acoplamento da QCD a valores moderados no regime infravermelho. O acoplamento pode ser parametrizado em termos de uma massa efetiva para o gluon (mg) obtida dinamicamente através das equações de Schwinger- Dyson, cuja soluções são compatíveis com as simulações da QCD na rede. Primeiro nós consideramos o processo de aniquilação elétron-pósitron em hádrons Re+e- até O(3s) e adotamos o método de smearing sugerido por Poggio, Quinn e Weinberg para confrontar os dados experimentais com a teoria. Nós vamos usar como modelo teórico a QCD com uma constante de acoplamento finita no regime de baixas energias. Para encontrar o melhor fit entre os dados experimentais e teóricos, nós realizamos um test de 2, que dentro das incertezas do modelo , tem um valor mínimo quando mg=QCD está entre 1.2 - 1.4. Esses valores concordam com outras determinações fenomenológicas da razão mg=QCD e levam a uma carga efetiva s(0) 0.7. Nós comentamos como essas cargas efetivas poderiam afetar a escala de massa da dualidade global, a qual indica a fronteira entre a física perturbativa e não perturbativa. Calculamos tanto o potencial efetivo aprimorado no caso da QED escalar e da QCD com um escalar sem cor, como também a evolução do acoplamento escalar do Higgs () no Modelo Padrão. Em ambos os casos consideramos pontos fixos. No caso da QCD com o escalar sem carga de cor tanto a barreira associada ao polo de Landau quanto o mínimo do potencial mudam. Por outro lado, encontramos que a existência dos pontos fixos não perturbativos no infravermelho movem a evolução do acoplamento escalar na direcção da estabilidade. Para certos valores da constante de acoplamento da QCD no infravermelho, o potencial do Modelo Padrão pode ficar estável até a escala de Planck.
Several phenomenological and theoretical arguments favor a freezing of the Quantum Chromodynamics (QCD) coupling constant in the infrared region at one moderate value. This coupling can be parameterized in terms of an effective dynamical gluon mass (mg) which is determined through Schwinger-Dyson equations, whose solutions are compatible with QCD lattice simulations. First we consider the electron-positron annihilation process into hadrons Re+e- up to O(3s) and we adopt the smearing method suggest by Poggio, Quinn and Weinberg to confront the experimental data with theory. As a theoretical model we use the aforementioned QCD coupling constant frozen in the low energy regime. In order to find the best fit between experimental data and theory we perform a 2 study, that, within the uncertainties of the approach, has a minimum value when mg=QCD is in the range 1.2 - 1.4. These values are in agreement with other phenomenological determinations of this ratio and lead to an infrared effective charge s(0) 0.7. We comment how this effective charge may affect the global duality mass scale that indicates the frontier between perturbative and nonperturbative physics. We also compute the improved effective potential in the case of scalar QED and QCD with a colorless scalar and compute the Standard Model scalar boson Higgs coupling () evolution. In both cases we consider fixed points. In the case of QCD with a colorless scalar not only the barrier associated to the Landau pole is changed but the local minimum of the potential is also changed. On the other hand we find that the existence of such nonperturbative infrared fixed point moves the evolution towards stability. For the phenomenological preferred IR value of the QCD coupling constant the standard model Higgs potential may be stable up to the Planck scale.
Gianfelici, Alessandro. "A linear O(N) model: a functional renormalization group approach for flat and curved space". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8343/.
Pełny tekst źródłaRose, Félix. "Dynamique et transport au voisinage d'une transition de phase quantique en dimension deux". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066558/document.
Pełny tekst źródłaWe study the relativistic O (N) model, a quantum generalization of the φ⁴ theory used in statistical physics to study some phase transitions. This model describes quantum phase transitions such as the Mott insulator-superluid transition in boson gases trapped in optical latices or the paramagnetic-antiferromagnetic transition in magnets. In two space dimensions, these systems exhibit strong correlations near the transition. We study them using the nonperturbative renormalization group, an implementation of Wilson’s renormalization group. We focus on the universal properties in the vicinity of the zero-temperature quantum phase transition. We determine the universal scaling functions which define the thermodynamics and we show that these functions are related to those describing the critical Casimir forces in a three-dimensional system. Then, we study the excitation spectrum in the zero-temperature ordered phase. For N = 2 and 3, we establish the existence of an amplitude mode, also called “Higgs mode” by analogy with the Higgs mechanism in high-energy physics. For N = 1, we show the existence of a bound state at dimensions close to three. Finally, we compute the frequency-dependent conductivity at zero temperature and confirm its universal character, in particular at the transition. We prove that one of the components of the conductivity tensor in the ordered phase is a “superuniversal” quantity depending neither on the distance to the critical point nor on N
Haberichter, Mareike Katharina. "Classically spinning and isospinning non-linear σ-model solitons". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/classically-spinning-and-isospinning-nonlinear-sigmamodel-solitons(59f1d53d-0de7-4938-ad02-85ac57f6003f).html.
Pełny tekst źródłaWong, Jin-Mann. "Gauge theories and geometry in non-perturbative string theory". Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/gauge-theories-and-geometry-in-nonperturbative-string-theory(4820d230-9e36-4b13-8ba9-13856b90b858).html.
Pełny tekst źródłaAntonov, Dmitri. "String Representation of Gauge Theories". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1999. http://dx.doi.org/10.18452/14472.
Pełny tekst źródłaThe main problem addressed in the present Dissertation was an attempt of an analytical description of confinement in QCD and other gauge theories. As a guiding principle for our investigations served the so-called Wilson's picture of confinement, according to which this phenomenon can be described in terms of some effective theory of strings, joining coloured objects to each other and preventing them from moving apart to macroscopic distances. In this Dissertation, we have proceeded with a derivation of such string theories corresponding to various gauge ones, including QCD, i.e. with the solution of the problem of string representation of gauge theories. We have started our analysis with the nonlocal string effective action, arising within the so-called Stochastic Vacuum Model of QCD, where the interaction between the string world-sheet elements is mediated by the phenomenological background gluon propagator. By performing the derivative expansion of this action, we have derived the first few terms of a string Lagrangian. The first two nontrivial of them turned out to be the Nambu-Goto and rigidity terms with the coupling constants expressed completely via the gluonic condensate and correlation length of the QCD vacuum. The signs of these constants ensure the stability of strings in the so-obtained effective string theory. After that, we have investigated the problem of crumpling for the string world-sheets by derivation of the topological string term in the instanton gas model of the gluodynamics vacuum. Next, by making use of perturbation theory in the nonperturbative QCD vacuum, we have calculated perturbative corrections to the obtained string effective action. Those lead to a new form of the nonlocal string effective action with the propagator between the elements of the world-sheet being the one of a perturbative gluon in the confining background. By the derivative expansion of this action, we got a correction to the rigidity term coupling constant, whereas the string tension of the Nambu-Goto term occurs to get no corrections due to perturbative gluonic exchanges. Finally, we have derived the Hamiltonian of QCD string with spinless quarks at the ends, associated with the obtained string effective action including the rigidity term. In the particular case of vanishing orbital momentum of the system, this Hamiltonian reduces to that of the so-called relativistic quark model, albeit with some modifications due to the rigidity term, which might have some influence on the dynamics of the QCD string with quarks. All these topics have been elaborated on in Section 2, and form the essence of the string representation of QCD within the Stochastic Vacuum Model. In Section 3, we have addressed the problem of string representation of Abelian-projected theories. In this way, we have started with the string representation for the partition function of the simplest model of this kind, namely the Abelian-projected SU(2)-QCD, which is argued to be the dual Abelian Higgs Model with external electrically charged particles. The advantage of this approach to the string representation of QCD w.r.t. the one based on the Stochastic Vacuum Model is a possibility to get an integration over the string world-sheets, resulting from the integration over the singular part of the phase of the Higgs field. After the string representation of the partition function in the London limit, we have proceeded with the string representation for the generating functionals of the field strength and monopole current correlators. Those enabled us to find the corresponding bilocal cumulants and demonstrate that the large-distance asymptotic behaviour of the bilocal field strength cumulant matches the one of the corresponding gauge-invariant cumulant in QCD, predicted by the Stochastic Vacuum Model and measured in the lattice experiments. This result supports the method of Abelian projection on the one hand and gives a new field-theoretical status to the Stochastic Vacuum Model on the other hand. After that, we have extended our analysis beyond the London limit, and studied the relation of the quartic cumulant, which appears there, with the bilocal one in the London limit. Next, by making use of the Abelian projection method, we have addressed the problem of string representation of the SU(3)-gluodynamics. Namely, we have casted the related dual model, containing three types of magnetic Higgs fields, into the string form. Consequently, the latter one turned out to contain three types of strings, among which only two ones were actually independent. As a result, we have found, that both the ensemble of strings as a whole and individual strings display confining properties in a sense that all types of strings (self)interact via the exchanges of the massive dual gauge bosons. We have also derived bilocal cumulants in the effective dual model of confinement, corresponding to the SU(3)-gluodynamics, and they turned out to be also in line with the ones predicted by the Stochastic Vacuum Model. In conclusion of this topic, we have obtained another useful representation for the partition functions of the Abelian-projected theories in the form of an integral over the monopole currents. In Section 4, we have studied another model, allowing for an analytical description of confinement, which is 3D compact QED. In this way, by virtue of the integral over the monopole densities, we have derived string representation for the Wilson loop in this theory and demonstrated the correspondence of this representation to another recently found one, the so-called confining string theory. After that, we have calculated the bilocal cumulant of the field strength tensors in the weak-field limit of the model under study. It also turned out to be in line with the general concepts of the Stochastic Vacuum Model and therefore matches the corresponding results known from the lattice measurements in QCD and found analytically for the effective Abelian-projected theories in the previous Section. Besides that, string representations of the partition functions of the weak-field limit of 3D compact QED and of the dual Abelian Higgs Model turned out to be also quite similar. We have illustrated later on that this correspondence is not accidental. Namely, we have shown that 3D compact QED is nothing else, but the limiting case of 3D Abelian Higgs Model with external monopoles, corresponding to the vanishing gauge boson mass. Finally, we have elaborated on a unified method of description of the string world-sheet excitations in the Abelian-projected theories, compact QED, and QCD, based on the techniques of nonlinear sigma-models, and obtained the effective action, quadratic in the world-sheet fluctuations. In conclusion, the proposed nonperturbative techniques provide us with some new information on the mechanisms of confinement in QCD and other gauge theories and shed some light on the vacuum structure of these theories. They also show the relevance of string theory to the description of this phenomenon and yield several prescriptions for the construction of the adequate string theories from the corresponding gauge ones.
McDonald, Christopher. "Electron Dynamics in Finite Quantum Systems". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26105.
Pełny tekst źródłaDuclut, Charlie. "Nonequilibrium critical phenomena : exact Langevin equations, erosion of tilted landscapes". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066241/document.
Pełny tekst źródłaThis manuscript is focused on the study of critical phenomena taking place out-of-equilibrium. In the description of such phenomena, Langevin equations are ubiquitous and are usually derived in a phenomenological way by adding a noise term to a deterministic mean-field equation. However, I show that for reaction-diffusion processes it is in fact possible to derive an exact Langevin equation from the microscopic process. A second part of my thesis work has been devoted to the study of specific nonequilibrium critical phenomena using the nonperturbative renormalization group (NPRG), which is a modern implementation of Wilson and Kadanoff's block-spin idea. This tool, very powerful in an equilibrium context, takes care of the growing spatial fluctuations that arise near criticality through the use of a regulator. In a nonequilibrium context, the temporal fluctuations also have to be controlled. I have therefore designed a regulator that tackles both spatial and temporal fluctuations. Finally, I have applied the NPRG techniques to a model of landscape erosion: indeed, the generic scaling behaviour that appear in erosional landscapes suggests the existence of an underlying mechanism naturally fine-tuned to be critical. The Kardar-Parisi-Zhang equation seems to give a correct model for landscape erosion at large length scale (>2 km), but fails to predict the scaling observed at smaller scale. A different model was thus suggested which takes into account the intrinsic anisotropy at smaller length scale (the slope of the mountain). Using NPRG techniques, I show that this model possesses a line of fixed points associated with a continuous range of scaling exponents
Capri, Marcio André Lopes. "Aspectos não perturbativos das teorias de Yang-Mills no calibre abeliano maximal". Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1373.
Pełny tekst źródłaNeste tese, estudamos os efeitos não perturbativos associados à presença do horizonte de Gribov e à condensação de operadores locais de dimensão dois, numa teoria de Yang-Mills euclidiana em SU(2), quantizada no calibre abeliano maximal. Estes efeitos são introduzidos de modo a preservar as propriedades de renormalizabilidade e localidade da teoria, e refletem-se diretamente no comportamento dos propagadores. A comparação com os dados da rede indicam um bom acordo qualitativo.
In this, we study the nonperturbative effects associated to the presence of the horizon and to the condensation of local dimension two operators in an Eucledean SU(2)Yang-Mills theory quantized in the maximal Abelian gauge. Such effects are introduced in a way to preserve the properties of renormalizability and locality of the theory. The comparison with the lattice data indicates a good qualitative agreement.
Na, Euysoo. "Nonperturbative methods in particle physics". 1999. https://scholarworks.umass.edu/dissertations/AAI9950191.
Pełny tekst źródłaHutauruk, Parada Tobel Paraduan. "Nonperturbative aspects of kaon structure". Thesis, 2016. http://hdl.handle.net/2440/99170.
Pełny tekst źródłaThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2016.
丸, 信人, i N. Maru. "Nonperturbative Dynamics in Supersymmetric Gauge Theories". Thesis, 1999. http://hdl.handle.net/2237/16317.
Pełny tekst źródłaDetmold, William. "Nonperturbative approaches to quantum chromodynamics / William Detmold". Thesis, 2002. http://hdl.handle.net/2440/21733.
Pełny tekst źródłaChronological list of the author's works: p. 155.
viii, 162 p. : ill. ; 30 cm.
Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 2002
Schleifenbaum, Wolfgang [Verfasser]. "Nonperturbative aspects of Yang-Mills theory / vorgelegt von Wolfgang Schleifenbaum". 2008. http://d-nb.info/989071529/34.
Pełny tekst źródłaVolkholz, Jan [Verfasser]. "Nonperturbative studies of quantum field theories on noncommutative spaces / von Jan Volkholz". 2007. http://d-nb.info/987634283/34.
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