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Literatura académica sobre el tema "Quantum thermal field theory"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Quantum thermal field theory"

Bros, Jacques. "Thermal Aspects in Quantum Field Theory". Annales Henri Poincaré 4, S2 (diciembre de 2003): 863–80. http://dx.doi.org/10.1007/s00023-003-0967-1.

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Rahaman, Mahfuzur, Trambak Bhattacharyya y Jan-e. Alam. "Phenomenological Tsallis distribution from thermal field theory". International Journal of Modern Physics A 36, n.º 20 (14 de julio de 2021): 2150154. http://dx.doi.org/10.1142/s0217751x21501542.

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Classical and quantum Tsallis distributions have been widely used in many branches of natural and social sciences. But, the quantum field theory of the Tsallis distributions is relatively a less explored arena. In this paper, we derive the expression for the thermal two-point functions in the Tsallis statistics with the help of the corresponding statistical mechanical formulations. We show that the quantum Tsallis distributions used in the literature appear in the thermal part of the propagator much in the same way the Boltzmann–Gibbs distributions appear in the conventional thermal field theory. As an application of our findings, we calculate the thermal mass in the [Formula: see text] scalar field theory within the realm of the Tsallis statistics.

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HENNING, P. A., K. NAKAMURA y Y. YAMANAKA. "THERMAL FIELD THEORY IN NON-EQUILIBRIUM STATES". International Journal of Modern Physics B 10, n.º 13n14 (30 de junio de 1996): 1599–614. http://dx.doi.org/10.1142/s0217979296000696.

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Conventional transport theory is not really applicable to nonequilibrium systems which exhibit strong quantum effects. We present two different approaches to overcome this problem. Firstly we point out how transport equations may be derived that incorporate a nontrivial spectral function as a typical quantum effect, and test this approach in a toy model of a strongly interacting degenerate plasma. Secondly we explore a path to include nonequilibrium effects into quantum field theory through momentum mixing transformations in Fock space. Although the two approaches are completely orthogonal, they lead to the same coherent conclusion.

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Liao, Sen-Ben, Janos Polonyi y Dapeng Xu. "Quantum and thermal fluctuations in field theory". Physical Review D 51, n.º 2 (15 de enero de 1995): 748–64. http://dx.doi.org/10.1103/physrevd.51.748.

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Braga de Góes Vasconcellos, João, Nicolò Drago y Nicola Pinamonti. "Equilibrium States in Thermal Field Theory and in Algebraic Quantum Field Theory". Annales Henri Poincaré 21, n.º 1 (28 de octubre de 2019): 1–43. http://dx.doi.org/10.1007/s00023-019-00859-3.

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CHU, H. y H. UMEZAWA. "A UNIFIED FORMALISM OF THERMAL QUANTUM FIELD THEORY". International Journal of Modern Physics A 09, n.º 14 (10 de junio de 1994): 2363–409. http://dx.doi.org/10.1142/s0217751x94000960.

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We present a comprehensive review of the most fundamental and practical aspects of thermo-field dynamics (TFD), including some of the most recent developments in the field. To make TFD fully consistent, some suitable changes in the structure of the thermal doublets and the Bogoliubov transformation matrices have been made. A close comparison between TFD and the Schwinger-Keldysh closed time path formalism (SKF) is presented. We find that TFD and SKF are in many ways the same in form; in particular, the two approaches are identical in stationary situations. However, TFD and SKF are quite different in time-dependent nonequilibrium situations. The main source of this difference is that the time evolution of the density matrix itself is ignored in SKF while in TFD it is replaced by a time-dependent Bogoliubov transformation. In this sense TFD is a better candidate for time-dependent quantum field theory. Even in equilibrium situations, TFD has some remarkable advantages over the Matsubara approach and SKF, the most notable being the Feynman diagram recipes, which we will present. We will show that the calculations of two-point functions are simplified, instead of being complicated, by the matrix nature of the formalism. We will present some explicit calculations using TFD, including space-time inhomogeneous situations and the vacuum polarization in equilibrium relativistic QED.

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Kovalchuk, E. y R. Kobes. "Bose-Einstein condensates and thermal field theory". Canadian Journal of Physics 85, n.º 6 (1 de junio de 2007): 647–52. http://dx.doi.org/10.1139/p07-058.

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We consider a homogeneous nonideal Bose gas in equilibrium at nonzero temperature below the critical temperature Tc in the framework of thermal field theory. Quantum corrections up to second order are calculated, which are shown to be crucial in obtaining the correct behavior in thermodynamic quantities such as the specific heat. PACS Nos.: 67.40.–w, 11.10.Wx

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Mirón Granese, Nahuel, Alejandra Kandus y Esteban Calzetta. "Field Theory Approaches to Relativistic Hydrodynamics". Entropy 24, n.º 12 (7 de diciembre de 2022): 1790. http://dx.doi.org/10.3390/e24121790.

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Just as non-relativistic fluids, oftentimes we find relativistic fluids in situations where random fluctuations cannot be ignored, with thermal and turbulent fluctuations being the most relevant examples. Because of the theory’s inherent nonlinearity, fluctuations induce deep and complex changes in the dynamics of the system. The Martin–Siggia–Rose technique is a powerful tool that allows us to translate the original hydrodynamic problem into a quantum field theory one, thus taking advantage of the progress in the treatment of quantum fields out of equilibrium. To demonstrate this technique, we shall consider the thermal fluctuations of the spin two modes of a relativistic fluid, in a theory where hydrodynamics is derived by taking moments of the Boltzmann equation under the relaxation time approximation.

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Fulling, S. A., A. G. S. Landulfo y G. E. A. Matsas. "The relation between quantum and classical field theory with a classical source". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, n.º 2243 (noviembre de 2020): 20200656. http://dx.doi.org/10.1098/rspa.2020.0656.

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Classical field theory is about fields and how they behave in space–time. Quantum field theory, in practice, usually seems to be about particles and how they scatter. Nevertheless, classical fields must emerge from quantum field theory in appropriate limits, and Michael Duff showed how this happens for the Schwarzschild solution in perturbative quantum gravity. In a series of papers, we and others have shown how classical radiation from an accelerated charge emerges from quantum field theory when the Unruh thermal effect is taken into account. Here, we sharpen those conclusions by showing that, even at finite times, the quantum picture is meaningful and is in close agreement with the classical picture.

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CHU, H. y H. UMEZAWA. "STABLE QUASIPARTICLE PICTURE IN THERMAL QUANTUM FIELD PHYSICS". International Journal of Modern Physics A 09, n.º 10 (20 de abril de 1994): 1703–29. http://dx.doi.org/10.1142/s0217751x9400073x.

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It is well known that physical particles are thermally dissipative at finite temperature. In this paper we reformulate both the equilibrium and nonequilibrium thermal field theories in terms of stable quasiparticles. We will redefine the thermal doublets, the double tilde conjugation rules and the thermal Bogoliubov transformations so that our theory can be consistent for most general situations. All operators, including the dissipative physical particle operators, are realized in a Fock space defined by the stable quasiparticles. The propagators of the physical particles are expressed in terms of the operators of such stable quasiparticles, which is a simple diagonal matrix with the diagonal elements being the temporal step functions, same as the propagators in the usual quantum field theory without thermal degrees of freedom. The proper self-energies are also expressed in terms of these stable quasiparticle propagators. This formalism inherits the definition of on-shell self-energy in the usual quantum field theory. With this definition, a self-consistent renormalization is formulated which leads to quantum Boltzmann equation and the entropy law. With the aid of a doublet vector algebra we have an extremely simple recipe for computing Feynman diagrams. We apply this recipe to several examples of equilibrium and nonequilibrium two-point functions, and to the kinetic equation for the particle numbers.

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Tesis sobre el tema "Quantum thermal field theory"

BRAGA, DE GOES E. VASCONCELLOS JOAO. "Thermal equilibrium states in perturbative Algebraic Quantum Field Theory in relation to Thermal Field Theory". Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/979745.

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In the first part, we analyse the properties of an interacting, massive scalar field in an equilibrium state over Minkowski spacetime. We compare the known real- and imaginary-time formalisms of Thermal Field Theory with the recent construction by Fredenhagen and Lindner of a KMS state for perturbative interacting theories in the context of perturbative Algebraic Quantum Field Theory, in the adiabatic limit. In particular, we show that the construction of Fredenhagen and Lindner reduces to the real-time formalism only if the cocycle which intertwines between the free and interacting dynamics can be neglected. Furthermore, the Fredenhagen and Lindner construction reduces to the ordinary imaginary-time formalism if one considers the expectation value of translation invariant observables. We thus conclude that a complete description of thermal equilibrium for interacting scalar fields is generally obtained only by means of the state constructed by Fredenhagen and Lindner, which combines both formalisms of Thermal Field Theory. We also discuss the properties of the expansion of the Fredenhagen and Lindner construction in terms of Feynman diagrams in the adiabatic limit. We finally provide examples showing that the real- and the imaginary-time formalisms fail to describe thermal equilibrium already at first or second order in perturbation theory. The results presented in this part are summarized in (BDP19). In the second part, we discuss the so-called secular effects, characterized by the appearance of polynomial divergences in the large time limit of truncated perturbative expansions of expectation values in Quantum Field Theory. We show that, although such effect is an artifact of perturbation theory, and thus may not be obtained via exactly solving the dynamical equation if possible, they do not represent the breakdown of perturbation theory itself. Instead, we show that the polynomial divergences follow from a bad choice of state, and we present examples of states which produce expectation values whose perturbative expansion does not present secular effects. In particular, we point that it is possible to obtain non time-divergent perturbative expressions from thermal equilibrium states for the interacting theory. This last part is based on a research project which, by the time this thesis was written, had not been concluded yet.

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Anglin, J. R. (James Robert). "Influence functionals and thermal effects in quantum field theory". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41522.

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This thesis consists of two papers, dealing with complementary applications of the Feynman-Vernon influence functional formalism to describe different thermal effects in quantum fields. In the first paper, a black body of finite extent is treated as an unobserved environment in the course of a microscopic derivation of black body radiation. In the second paper, a quantum field is treated as an environment probed by a pointlike accelerating detector, which experiences the thermal Unruh effect (apparent heating of the vacuum). Issues of locality and directionality in quantum field theory are treated in both papers.

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Millington, Peter William. "Thermal quantum field theory and perturbative non-equilibrium dynamics". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/thermal-quantum-field-theory-and-perturbative-nonequilibrium-dynamics(9e2e162f-124c-4f97-9c01-9f585d7aedb4).html.

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In this thesis, we develop a perturbative formulation of non-equilibrium thermal quantum field theory, capable of describing the evolution of both temporal and spatial inhomogeneities in relativistic, quantum-statistical ensembles. We begin with a review of the necessary prerequisites from classical thermodynamics, classical and quantum statistical mechanics, quantum field theory and equilibrium thermal field theory. Setting general boundary conditions on the ensemble expectation values of products of interaction-picture creation and annihilation operators, we derive free propagators in which space-time translational invariance is explicitly broken. By means of the Schwinger-Kelydsh, closed-time path formalism, we are then able to introduce a path-integral description that accounts consistently for these temporal and spatial inhomogeneities. Subsequently, we develop a time-dependent perturbation theory that is free of the pathologies previously thought to spoil such approaches to non-equilibrium dynamics. Following an unambiguous definition of the number density of particles, we derive from first principles perturbative, field-theoretic evolution equations for statistical distribution functions. These evolution equations do not rely on the gradient expansion of so-called Wigner functions, as is necessary in the alternative Kadanoff-Baym approach, and are consistent with the well-known Boltzmann equations in the classical limit. Finally, with reference to a simple toy model, we highlight the appearance of processes otherwise kinematically disallowed in existing approaches to thermal field theory. These evanescent contributions are a consequence of the microscopic violation of energy conservation and are shown to be significant to the early-time evolution of non-equilibrium systems. We observe that the spectral evolution oscillates with time-dependent frequencies, which is interpreted as a signal of non-Markovian, memory effects.

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Metikas, Georgios. "Aspects of thermal field theory with applications to superconductivity". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312156.

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Eltzner, Benjamin. "Local Thermal Equilibrium on Curved Spacetimes and Linear Cosmological Perturbation Theory". Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-117472.

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In this work the extension of the criterion for local thermal equilibrium by Buchholz, Ojima and Roos to curved spacetime as introduced by Schlemmer is investigated. Several problems are identified and especially the instability under time evolution which was already observed by Schlemmer is inspected. An alternative approach to local thermal equilibrium in quantum field theories on curved spacetimes is presented and discussed. In the following the dynamic system of the linear field and matter perturbations in the generic model of inflation is studied in the view of ambiguity of quantisation. In the last part the compatibility of the temperature fluctuations of the cosmic microwave background radiation with local thermal equilibrium is investigated
In dieser Arbeit wird die von Schlemmer eingeführte Erweiterung des Kriteriums für lokales thermisches Gleichgewicht in Quantenfeldtheorien von Buchholz, Ojima und Roos auf gekrümmte Raumzeiten untersucht. Dabei werden verschiedene Probleme identiﬁziert und insbesondere die bereits von Schlemmer gezeigte Instabilität unter Zeitentwicklung untersucht. Es wird eine alternative Herangehensweise an lokales thermisches Gleichgewicht in Quantenfeldtheorien auf gekrümmten Raumzeiten vorgestellt und deren Probleme diskutiert. Es wird dann eine Untersuchung des dynamischen Systems der linearen Feld- und Metrikstörungen im üblichen Inﬂationsmodell mit Blick auf Uneindeutigkeit der Quantisierung durchgeführt. Zuletzt werden die Temperaturﬂuktuationen der kosmischen Hintergrundstrahlung auf Kompatibilität mit lokalem thermalem Gleichgewicht überprüft

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Ferreira, Renan Buosi. "Teorias de calibre à temperatura finita e a equação de Boltzmann". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-10112015-091130/.

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A equivalência entre o formalismo de equação de transporte de Boltzmann e o limite de altas temperaturas da teoria de campos à temperatura finita é investigada no contexto das teorias de calibre. Essa conexão é feita através da comparação direta entre as amplitudes térmicas obtidas via a equação de transporte, sem termo de colisão, com aquelas resultantes do limite HTL das funções de Green térmicas em ordem de um loop. Para o formalismo quântico, partimos de um ensemble em equilíbrio, cujos efeitos térmicos são descritos via formalismo do tempo imaginário. Isso permite expressar as funções de Green térmicas como uma média estatística de amplitudes frontais (após continuação analítica). Já para o caso do formalismo clássico, combinamos as equações de Wong com a variação temporal da função de distribuição de partículas no espaço de fase. A equação resultante pode ser resolvida iterativamente, o que permite obter as várias ordens de aproximação para a corrente e as respectivas amplitudes térmicas. Finalmente, comparando as amplitudes obtidas a partir dos dois formalismos, pudemos verificar a sua equivalência. Ademais, apresentamos cálculos explícitos até segunda ordem de aproximação no caso de uma teoria não abeliana, e até quarta ordem para uma teoria abeliana, quando a distribuição de cargas é não neutra.
The equivalence between the formalism of Boltzmann transport equation and the high temperature limit of thermal field theory is investigated in the context of gauge theories. This connection is made through a direct comparison between the thermal amplitudes obtained via the collisionless transport equation with those resulting from the HTL limit of one loop thermal Greens function. For the quantum formalism we start with an ensemble in equilibrium, whose thermal effects are described by the imaginary time formalism. This allows one to write the thermal Green functions as a statistical average of forward scattering amplitudes (after analytic continuation). For the classical formalism, we combine Wongs equations with the time derivative of the particle distribution function in phase space. The resulting equation can be solved in an iterative fashion, yielding the perturbative results for the current and the respective thermal amplitudes. Finally, comparing the amplitudes obtained from the two formalisms, we were able to verify their equivalence. Moreover, we present explicit calculations for a non-Abelian theory up to the second order approximation, and in the case of an abelian theory we proceed up to fourth order, when the charge distribution is not neutral.

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Gonzalez, Yuber Ferney Perez. "Leptogênese e mecanismo de See-Saw de tipo I na teoria quântica de campos fora do equilíbrio térmico". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24092014-151403/.

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Um dos problemas mais importantes que precisa ser resolvido, tanto pela física de partículas como pela cosmologia, é a existência de assimetria bariônica. Entre os cenários mais atrativos para a geração dinâmica da assimetria bariônica (Bariogênese) encontra- se a denominada Leptogênese. Nesse cenário, cria-se uma assimetria leptônica que será convertida em assimetria bariônica por processos não perturbativos mediados por sphalerons. Na realização mais simples da Leptogênese, que será estudada nesta dissertação, neutrinos pesados de mão direita, produzidos termicamente, decaem violando CP, gerando um assimetria leptônica nesses decaimentos. O principal atrativo deste cenário é que conecta duas escalas aparentemente diferentes: a escala da geração de assimetria leptônica e a escala das massas e oscilações dos neutrinos ativos mediante o mecanismo de See-Saw. O estudo usual da Leptogênese utiliza equações de Boltzmann para determinar a evolução temporal da assimetria. Porém, a equação de Boltzmann é uma equação semiclássica, dado que envolve, por um lado, uma função clássica no espaço de fases, a função de distribuição, mas, por outro, os termos de colisão envolvem quantidades obtidas na teoria quântica de campos à temperatura nula. Em particular, a formulação de Boltzmann não permite descrever fenômenos quânticos como oscilações coerentes e efeitos de decoêrencia e interferência. Uma descrição quântica completa da evolução da assimetria leptônica na leptogênese deve, de fato, ser obtida no contexto da teoria quântica de campos fora do equilíbrio térmico. O formalismo de Schwinger-Keldysh permite realizar isso. Nesta dissertação descreveremos a leptogênese no formalismo de Schwinger-Keldysh para o caso em que são adicionados ao espectro de partículas do Modelo Padrão três neutrinos de mão direita, sem fazer qualquer suposição sobre a hierarquia de massas.
One of the most important problems that is needed to solve by the Elementary Particle Physics as well as by the Cosmology is the existence of baryonic asymmetry. Among the most attractive scenarios of dynamic generation of baryonic asymmetry (Baryogenesis) is the so-called Leptogenesis. In that scenario, a leptonic asymmetry is treated in such a way that it will be converted in baryonic asymmetry by non-perturbative processes mediated by sphalerons. In the simplest realization of Leptogenesis, that will be studied in this disertation, heavy right-handed neutrinos, produzed thermally, decay violating CP generating a leptonic asymmetry in these decays. The principal attractive of this scenario is that it connects two apparently different scales, the scale of leptonic asymmetry generation and the scale of masses and oscillations of the active neutrinos through the See-Saw mechanism. The usual study of the leptogenesis uses Boltzmann equations in order to determine the temporal evolution of the asymmetry. However, the Boltzmann equation is a semiclassical equations, since, on one side, it is formulated for a classical function in phases space, the distribution function, but, on the other hand, the collision term involves quantities obtained in the Quantum Field Theory at zero temperature. In particular, Boltzmann formulation does not allow to describe quantum phenomena such coherent oscillations and effects of decoherence and interference. Indeed, a proper quantum description of the evolution of the leptonic asymmetry must be obtained in the context of the Non-Equilibrium Quantum Field Theory. The Schwinger-Keldysh formalism allows to perform this. In this dissertation, leptogenesis is described using the Schwinger-Keldysh formalism for the case in which there are three right-handed neutrinos without a definite mass hierarchy.

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Salehi, Kasmaei Babak. "NONEQUILIBRIUM PROBES OF THE QUARK-GLUON PLASMA". Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1627035862984205.

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Oeckl, Robert. "Quantum geometry and Quantum Field Theory". Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621912.

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Gupta, Neha. "Homotopy quantum field theory and quantum groups". Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/38110/.

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The thesis is divided into two parts one for dimension 2 and the other for dimension 3. Part one (Chapter 3) of the thesis generalises the definition of an n-dimensional HQFT in terms of a monoidal functor from a rigid symmetric monoidal category X-Cobn to any monoidal category A. In particular, 2-dimensional HQFTs with target K(G,1) taking values in A are generated from any Turaev G-crossed system in A and vice versa. This is the generalisation of the theory given by Turaev into a purely categorical set-up. Part two (Chapter 4) of the thesis generalises the concept of a group-coalgebra, Hopf group-coalgebra, crossed Hopf group-coalgebra and quasitriangular Hopf group-coalgebra in the case of a group scheme. Quantum double of a crossed Hopf group-scheme coalgebra is constructed in the affine case and conjectured for the more general non-affine case. We can construct 3-dimensional HQFTs from modular crossed G-categories. The category of representations of a quantum double of a crossed Hopf group-coalgebra is a ribbon (quasitriangular) crossed group-category, and hence can generate 3-dimensional HQFTs under certain conditions if the category becomes modular. However, the problem of systematic finding of modular crossed G-categories is largely open.

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Libros sobre el tema "Quantum thermal field theory"

Bellac, Michel Le. Thermal field theory. Cambridge: Cambridge University Press, 1996.

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Advanced field theory: Micro, macro, and thermal physics. New York: American Institute of Physics, 1993.

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Umezawa, Hiroomi. Advanced field theory: Micro, macro,and thermal physics. New York: American Institute of Physics, 1993.

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Umezawa, H. Advanced field theory: Micro, macro, and thermal physics. New York: American Institute of Physics, 1995.

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C, Khanna F., ed. Thermal quantum field theory: Algebraic aspects and applications. Hackensack, NJ: World Scientific, 2009.

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Millington, Peter. Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-01186-8.

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Hsing-yüan, Kuei, Khanna F. C, Su Zhao-bin 1937- y Workshop on Thermal Field Theories and Their Applications (4th : 1995 : Dalian, China), eds. Thermal field theories and their applications. Singapore: World Scientific, 1996.

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Tsukuba), Workshop on Thermal Field Theories and Their Applications (2nd 1990 University of. Thermal field theories: Proceedings of the 2nd Workshop on Thermal Field Theories and Their Applications, Tsukuba, Japan, July 23-27, 1990. Amsterdam: North-Holland, 1991.

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C, Khanna F., ed. Banff/CAP Workshop on Thermal Field Theory: Proceedings of the 3rd Workshop on Thermal Field Theories and Their Applications. Singapore: World Scientific, 1994.

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1994, Altherr Tanguy d., Aurenche P, Veneziano G y Sorba P, eds. From thermal field theory to neural networks: A day to remember Tanguy Altherr, Cern, 4 November 1994. Singapore: World Scientific, 1996.

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Capítulos de libros sobre el tema "Quantum thermal field theory"

Laine, Mikko y Aleksi Vuorinen. "Quantum Mechanics". En Basics of Thermal Field Theory, 1–15. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31933-9_1.

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Kotecha, Isha. "Thermal Group Field Theory". En On Generalised Statistical Equilibrium and Discrete Quantum Gravity, 95–166. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90969-7_5.

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Bros, Jacques. "Thermal Aspects in Quantum Field Theory". En International Conference on Theoretical Physics, 863–80. Basel: Birkhäuser Basel, 2003. http://dx.doi.org/10.1007/978-3-0348-7907-1_67.

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Millington, Peter. "Scalar Field Theory". En Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 81–91. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_7.

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Verch, Rainer. "Local Covariance, Renormalization Ambiguity, and Local Thermal Equilibrium in Cosmology". En Quantum Field Theory and Gravity, 229–56. Basel: Springer Basel, 2012. http://dx.doi.org/10.1007/978-3-0348-0043-3_12.

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Gransee, Michael. "Local Thermal Equilibrium States in Relativistic Quantum Field Theory". En Quantum Mathematical Physics, 101–17. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26902-3_6.

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Millington, Peter. "Quantum Statistical Mechanics". En Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 41–61. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_4.

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Millington, Peter. "Introduction". En Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 1–9. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_1.

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Millington, Peter. "Non-Homogeneous Backgrounds". En Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 111–27. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_10.

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Millington, Peter. "The Thermodynamic Equilibrium Limit". En Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, 129–40. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01186-8_11.

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Actas de conferencias sobre el tema "Quantum thermal field theory"

Braaten, Eric. "Renormalization group approach to thermal quantum field theory". En Computational quantum physics. AIP, 1992. http://dx.doi.org/10.1063/1.42603.

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Powers, Connor, Zohreh Davoudi y Niklas Mueller. "Toward Exploring Phase Diagrams of Gauge Theories on Quantum Computers with Thermal Pure Quantum States". En The 39th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.430.0029.

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Musho, T. D., S. M. Claiborne y D. G. Walker. "NEGF Quantum Simulation of Field Emission Devices". En ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44504.

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Recent studies of wide band-gap diamond field emission devices have realized superior performance and lifetime. However, theoretical studies using standard Fowler-Nordheim (FN) theory do not fully capture the physics of diamond semiconductor emitters as a result of the fitting parameters inherent to the FN approximation. The following research computationally models wide band-gap field emission devices from a quantum point of view, using a novel non-equilibrium Green’s function (NEGF) approach previously applied to modeling solid-state electronic devices. Findings from this research confirm non-linearities in the FN curve and provide alternative explanations to discrepancies between standard FN theory.

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Drummond, P. D. y S. J. Carter. "Quantum and thermal noise of solitons in optical fibers". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.tuv10.

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We develop a quantum theory of propagation in dispersive nonlinear media via a quantized field theory and a coherent state expansion. The resulting stochastic nonlinear Schrodinger equation includes both quantum fluctuations and thermal noise due to refractive-index fluctuations in the medium. The theory can describe either cw propagation with dispersion or soliton propagation. In the cw case, enhanced squeezing occurs with anomalous dispersion. This is reduced by thermal noise, just as it is in the normal dispersion case. The noise-induced reduction in squeezing is more severe with normal dispersion owing to the intrinsic lack of phase matching in the normal dispersion regime. With anomalous dispersion, the cancellation of nonlinear by linear dispersion allows squeezing to occur over a wide bandwidth even in the presence of thermal fluctuations. Our theory is also able to treat soliton propagation in the anomalous dispersion case. A substantial degree of pulsed squeezing is obtained, and we point out that an optimal detection scheme requires a pulsed local oscillator. Results for the effects of thermal noise on soliton propagation are presented, in which case improvement is obtained by reducing the soliton time duration.

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Narayanaswamy, Arvind y Yi Zheng. "Demystifying Lifshitz’ Theory of van der Waals Adhesion". En ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38353.

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Adhesion and cohesion of materials are of importance in many different areas of science and engineering, such as friction between objects, flow of liquids on solids or other liquid surfaces, and phase change heat transfer. One contribution to adhesive energy, irrespective of the type of material(s), is from van der Waals interactions, which arise from alteration of the quantum and thermal fluctuations of the electrodynamic field due to the presence of interfaces. Despite its importance, the theory of van der Waals interactions between macroscopic bodies, which is mainly due to Lifshitz, Dzyaloshinskii, and Pitaevskii, remains shrouded in relatively complicated language of quantum statistical physics. In this paper, we will present an alternate derivation which skirts quantum statistical physics (for most part) and relies primarily on a combination of classical electrodynamics and energy conservation.

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Hess, Harald F. "Near-field optical characterization of quantum wells and nanostructures". En Quantum Optoelectronics. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/qo.1995.qwa2.

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A spatial distribution of luminescent centers with sharp (<0.1meV), spectrally distinct emission lines are revealed in a GaAs/AlGaAs quantum wells[1] using low temperature nearfield scanning optical microscopy [2], a technique where a subwavelength source and/or detector of light in close proximity (<40nm) to the sample is used to probe with a resolution beyond the diffraction limit. These centers are the energy eigenstate components that comprise the inhomogeneously broadened line shape observed in standard far-field photoluminescence. Measurements as a function of temperature, magnetic field, and well width establish that these centers arise from excitons localized by quantum well thickness fluctuations. For sufficiently narrow wells, virtually all emission originates from such centers. Quantities such as diffusion (both thermal and tunneling), lateral confinement energies, lifetimes, g-factors from magnetic field induced spin splittings, diamagnetic energy coefficients of the luminescent states can now be measured at a site-by-site individual quantum level rather than averaged over a statistical distribution. This information can be used in turn to provide a direct local picture of the interface fluctuations and how they vary under different MBE growth conditions. Near-field microscopy/spectroscopy provides a means to access energies and homogeneous line widths for the individual eigenstates of these centers, and thus allows the luminescent components to be identified and characterized with the extraordinary detail previously limited to the realm of atomic physics.

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Meystre, Pierre, E. Schumacher, S. Stenholm y E. M. Wright. "Atomic beam deflection in a quantum field". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thbb6.

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We investigate to which extent the quantum nature of light modifies laser-induced atomic beam deflection in a plane standing wave. Our model considers a single two-level atom interacting with a single quantized standing wave mode of the electromagnetic field. We neglect spontaneous emission into other field modes, an approximation valid for short enough times. We find that there is an essential qualitative difference between the cases of a coherent field and a thermal field. For a coherent field, the atomic momentum distribution after interaction has two symmetric peaks on the wings and resembles the semiclassical result of Arimondo et al. [Phys. Rev. A 24, 898 (1981)]. For a thermal field, this distribution has its maximum at p = 0. It is characterized by a constant contribution at p = 0, some sharp interference features, and near-Gaussian wings. The only feature common to both cases is that in the Raman-Nath regime of scattering, the range on transverse momenta grows linearly with time at a rate proportional to 〈 n 〉 , where 〈 n 〉 is the mean number of photons in the field.

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Narayanaswamy, Arvind. "Near-Field Radiative Transfer, Dispersion Forces, and Dyadic Green’s Functions". En ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18136.

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Near–field force and energy exchange between two objects due to electrodynamic fluctuations give rise to dispersion forces such as Casimir and van der Waals forces, and thermal radiative transfer exceeding Plancks theory of blackbody radiation. The two phenomena dispersion forces and near–field enhancement of thermal radiation have common origins in the electromagnetic fluctuations. However, dispersion forces have contributions from quantum (zero–point) as well as thermal fluctuations whereas nearfield radiative transfer has contributions from thermal fluctuations alone. The forces are manifested through the Maxwell stress tensor of the electromagnetic field and radiative transfer through the Poynling vector. Both phenomena are elegantly described in terms of the Dyadic Greens function of the vector Helmholtz equation that governs the electromagnetic fields. In this talk, I will focus on the application of the Dyadic Greens function technique to near–field radiative transfer and dispersion forces. Despite the similarities, radiative transfer and forces have important differences that will be stressed on. I will end the talk with some open questions about the Dyadic Greens function formalism and its application to near–field radiative transfer.

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Moss, D. J. y T. Ido. "Calculation of photogenerated carrier escape rates from single GaAs / AlxGa1-xAs quantum wells." En International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.md.21.

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There has been intense interest in the past few years in photogenerated carrier escape mechanisms from quantum wells1. This process is not only fundamental to understanding carrier dynamics in quantum confined systems, but has direct relevance to speed and intensity saturation limits for quantum well waveguide photodetectors and electroabsorption modulators2, reverse biased laser structures3, and optical SEED devices4. Only recently1, however, have escape times for both electrons and holes from single quantum wells been simultaneously and unambiguously measured with sub-picosecond resolution, and the results appeared to contradict simple existing theories for escape rates based on thermionic emission5 and tunneling. In this paper, we directly compare the results of our theory for photogenerated carrier escape rates as a function of applied field from single GaAs/AlGaAs quantum wells, with the experimental results from [1]; that is, for wells with x=0.2 and x=0.4 barriers at room temperature. We include thermionic emission (and for electrons include the effects of indirect conduction band minima in the well), thermally assisted, and direct tunneling. Our expressions for thermionic emission reduce, in the limit of large well width, to those5 which assume a 3D density of states. We assume that carriers in the well are in thermal equilibrium with each other and with the lattice, so “thermally assisted tunneling” refers here to tunneling from thermally occupied upper sub-bands - the 2D equivalent of Fowler-Nordheim tunneling. We also assume parabolic bands for holes within the quantum well, accounting for light / heavy hole mixing by using effective in-plane masses taken from the literature. Tunneling lifetimes are calculated using a standard6 transfer matrix approach to obtain the linewidths and energy levels of the quasi-bound states as a function of applied field. Under these assumptions the thermionic emission rate for electrons is

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Liu, Yumin y Zhongyuan Yu. "Numerical Analysis the Strain Distribution of GaN/AlN Self-Organized Pyramid Quantum Dot". En 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21370.

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Based on the three-dimensional finite element approach, we investigate the strain field distribution of the GaN/AlN self-organized quantum dot. The truncated hexagonal pyramid quantum dot that has been found in experiment is adopted as the physical model in our simulation. The material elastic constants parameters used in this paper are of wurtzite structure, and there are five independent elastic constants. In dealing with the lattice mismatch, we employ a three-dimensional anisotropic pseudo-thermal expansion. We compare the calculated results with that calculated by Green’s function theory, in which many assumptions are made, and prove the correctness of our results. The strain distributions of the equal strain surface three-dimensional contour plots of the six strain components are given. Finally, the anisotropic characteristics of the GaN/AlN quantum dot material are discussed, the results demonstrate that the position of the elastic strain energy density minimum position is just located above the buried quantum dot and have no influence on the thickness of the capping layer. So the anisotropy has no obvious influence on the vertical alignment of post-growth of the next layer of quantum dots. Our model does not adopt the assumptions used in the Green’s function approach, so better reliability and precision of results are expected.

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Informes sobre el tema "Quantum thermal field theory"

Jafferis, Daniel. Topics in string theory, quantum field theory and quantum gravity. Office of Scientific and Technical Information (OSTI), marzo de 2021. http://dx.doi.org/10.2172/1846570.

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Jaffe, Arthur M. "Quantum Field Theory and QCD". Office of Scientific and Technical Information (OSTI), febrero de 2006. http://dx.doi.org/10.2172/891184.

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Caldi, D. G. Studies in quantum field theory. Office of Scientific and Technical Information (OSTI), marzo de 1993. http://dx.doi.org/10.2172/10165764.

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Hirshfeld, Allen. Deformation Quantization in Quantum Mechanics and Quantum Field Theory. GIQ, 2012. http://dx.doi.org/10.7546/giq-4-2003-11-41.

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Carena, Marcella y et al. QIS for Applied Quantum Field Theory. Office of Scientific and Technical Information (OSTI), marzo de 2020. http://dx.doi.org/10.2172/1606412.

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Bern, Z. Continuum regularization of quantum field theory. Office of Scientific and Technical Information (OSTI), abril de 1986. http://dx.doi.org/10.2172/7104107.

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Lawrence, Albion, Matthew Headrick, Howard Schnitzer, Bogdan Stoica, Djordje Radicevic, Harsha Hampapura, Andrew Rolph, Jonathan Harper y Cesar Agon. Research in Quantum Field Theory, Cosmology, and String Theory. Office of Scientific and Technical Information (OSTI), marzo de 2020. http://dx.doi.org/10.2172/1837060.

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Rammsdonk, Mark van. Quantum Hall Physics Equals Noncommutive Field Theory. Office of Scientific and Technical Information (OSTI), agosto de 2001. http://dx.doi.org/10.2172/787180.

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Alford, Mark G., Carl M. Bender, Claude W. Bernard, James H. Buckley, Francesc Ferrer, Henric S. Krawczynski y Michael C. Ogilvie. Studies in Quantum Field Theory and Astroparticle Physics. Office of Scientific and Technical Information (OSTI), julio de 2014. http://dx.doi.org/10.2172/1135921.

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Goldin, Gerald A. y David H. Sharp. Diffeomorphism Group Representations in Relativistic Quantum Field Theory. Office of Scientific and Technical Information (OSTI), diciembre de 2017. http://dx.doi.org/10.2172/1415360.

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