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Artigos de revistas sobre o assunto "Quantum space-times"
Calmet, Xavier, Roberto Casadio e Folkert Kuipers. "Singularities in quantum corrected space-times". Physics Letters B 807 (agosto de 2020): 135605. http://dx.doi.org/10.1016/j.physletb.2020.135605.
Texto completo da fonteDavis, Simon. "Desingularization of Black Hole Space-Times". Bulletin of Pure and Applied Sciences – Physics 42, n.º 1 (17 de junho de 2023): 6–34. http://dx.doi.org/10.48165/bpas.2023.42d.1.2.
Texto completo da fonteKONKOWSKI, D. A., e T. M. HELLIWELL. "QUANTUM SINGULARITIES IN STATIC AND CONFORMALLY STATIC SPACE-TIMES". International Journal of Modern Physics A 26, n.º 22 (10 de setembro de 2011): 3878–88. http://dx.doi.org/10.1142/s0217751x11054334.
Texto completo da fonteKONKOWSKI, D. A., e T. M. HELLIWELL. "QUANTUM SINGULARITIES IN STATIC AND CONFORMALLY STATIC SPACE-TIMES". International Journal of Modern Physics: Conference Series 03 (janeiro de 2011): 364–74. http://dx.doi.org/10.1142/s2010194511001462.
Texto completo da fonteParmeggiani, Claudio. "Quantum fields and gravity: Expanding space-times". International Journal of Modern Physics A 35, n.º 02n03 (30 de janeiro de 2020): 2040039. http://dx.doi.org/10.1142/s0217751x20400394.
Texto completo da fonteHudson, R. L. "Stop times in Fock space quantum probability". Stochastics 79, n.º 3-4 (junho de 2007): 383–91. http://dx.doi.org/10.1080/17442500601078966.
Texto completo da fonteBalachandran, AP. "Quantum space-times in the year 2002". Pramana 59, n.º 2 (agosto de 2002): 359–68. http://dx.doi.org/10.1007/s12043-002-0128-y.
Texto completo da fonteSánchez, N. "Quantum string theory in curved space-times". Astronomische Nachrichten: A Journal on all Fields of Astronomy 311, n.º 4 (1990): 231–38. http://dx.doi.org/10.1002/asna.2113110408.
Texto completo da fonteJanssen, Daan W. "Quantum Fields on Semi-globally Hyperbolic Space–Times". Communications in Mathematical Physics 391, n.º 2 (21 de fevereiro de 2022): 669–705. http://dx.doi.org/10.1007/s00220-022-04328-7.
Texto completo da fonteSKÁKALA, JOZEF, e MATT VISSER. "PSEUDO-FINSLERIAN SPACE–TIMES AND MULTIREFRINGENCE". International Journal of Modern Physics D 19, n.º 07 (julho de 2010): 1119–46. http://dx.doi.org/10.1142/s0218271810017172.
Texto completo da fonteTeses / dissertações sobre o assunto "Quantum space-times"
Hersent, Kilian. "Field theories on quantum space-times : towards the phenomenology of quantum gravity". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP031.
Texto completo da fonteNoncommutative geometry is a mathematical framework that expresses the structure of space-time in terms of operator algebras. By using the tools of quantum mechanics to describe the geometry, noncommutative space-times are expected to give rise to quantum gravity effects, at least in some regime. This manuscript focuses on the physical aspects of these so-called quantum space-times, in particular through the formalism of field and gauge theories. Scalar field theories are shown to possibly trigger mixed divergences in the infra-red and ultra-violet for the 2-point function at one loop. This phenomenon is generically called UV/IR mixing and stems from a diverging behaviour of the propagator. The analysis of such divergences differs from the commutative case because the momentum space is now also noncommutative. From another perspective, a gauge theory on κ-Minkowski, a quantum deformation of the Minkowski space-time, is derived. A first perturbative computation is shown to break the gauge invariance, a pathological behaviour common to other quantum space-times. A causality toy model is also developed on κ-Minkowski, in which an analogue of the speed-of-light limit emerges. The phenomenology of quantum gravity arising from quantum space-times is discussed, together with the actual constraints it imposes. Finally, a toy model for noncommutative gravity is tackled, using the former κ-Minkowski space-time to describe the tangent space. It necessitates the notion of noncommutative partition of unity specifically defined there
Dang, Nguyen Viet. "Renormalization of quantum field theory on curved space-times, a causal approach". Paris 7, 2013. http://www.theses.fr/2013PA077188.
Texto completo da fonteThe subject of the thesis is the construction of a perturbative quantum theory of interacting fields on a curved space-time, following a point of view pioneered by Stueckelberg and Bogoliubov and developed by Epstein-Glaser on the flat Minkowski space-time. In 2000 a breakthrough was done by Brunetti and Fredenhagen who were able to extend the Epstein-Glaser theory by exploiting the point of view developed by Radzikowski to define quantum states on a curved space-time in terms of wave-front sets. These results were further extended by Fredenhagen, Brunetti, Hollands, Wald, Rejzner, etc. To Yang-Mills fields and the gravitation. However, even for theories without gauge invariance, many mathematical details were left unexplored and unquestioned. The task of Viet was precisely to derive fully rigorously this theory in the case there is no gauge invariance. In my work, I propose a complete review of the result, solving numerous questions, adding many new results around this program and, eventually, giving more precise details on the counterterms and ambiguities in the renormalization process, and a deeper understanding of the geometry of the wave front set of the n-point functions. All this thesis uses various mathematical techniques: differential and pseudo Riemannian geometry, microlocal analysis and the symplectic geometry of wavefront sets, functional analysis, fine results from the theory of distributions, Hopf algebras, etc
Cozzella, Gabriel [UNESP]. "Information loss in black holes and the unitarity of quantum mechanics". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143416.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A teoria quântica de campos em espaços-tempos curvos é o arcabouço teórico mais sólido que temos para estudar a interação entre gravitação e mecânica quântica na ausência de uma teoria completa de gravitação quântica. Neste contexto, um problema que atraiu muita atenção dos físicos teóricos nas últimas décadas é o chamado “paradoxo da perda de informação em buracos negros”, onde a evolução de um estado quântico puro inicial para um estado quântico misto final caracterizaria uma violação das leis da mecânica quântica. Nesta dissertação nós argumentamos que a perda de informação em si não viola as leis da mecânica quântica e é consequência direta da teoria semi-clássica utilizada. Finalmente, argumentamos que a questão da recuperação da informação deve ser tratada utilizando-se uma teoria de gravitação quântica ainda desconhecida.
The quantum theory of fields in curved space-times is the most solid framework for studying the interplay between gravity and quantum mechanics in the absence of a complete theory of quantum gravity. In this scenario, one problem that has drawn much attention from the theoretical physics community in the last decades is the so-called “black hole information loss paradox”, where the evolution from an initial pure quantum state to a final mixed quantum state would constitute a violation of the laws of quantum mechanics. In this dissertation we argue that information loss does not violate quantum mechanics, being simply a consequence of the semi-classical framework adopted and that the question of information recovery needs to be addressed by a yet unknown theory of quantum gravity.
FAPESP: 2014/08684-9
Cavalcante, Everton. "Aspectos geométricos da molécula de fulereno em referenciais não-inerciais". Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/9557.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this thesis we study the dynamics of charge carriers, and the electronic properties, of the C60 fullerene molecule. Characterizing it by a geometric bias. In inertial reference systems and when we have your material under rotation content. Initially we discussed the scientific advent of carbon allotropes, and the importance of modelling its derivates at low energies. We show that at low energies, the graphene - the two-dimensional carbon allotrope form - can be described for a non-massive theory of free fermions. At a second moment, we extended the nonmassive free fermions theory for the C60 molecule. Assuming the hexagonal graphene network can be entered in fullerene when we introduce topological defects. A brief study of topological defects in condensed matter was done. And soon after, we made a description these defects via a non-Euclidean geometry. Showing how the charge carriers in the network see the defects like gauge fields. Then we began to expose the results of this thesis. First we assume the fullerene by a two-dimensional spherical metric with defects, containing a fictitious t’Hooft-Polyakov monopole in its center. TheC60 is still subjected to the action of an Aharonov-Bohm flux arising of a magnetic wire running through its poles. So we get the spectrum, and the prediction of a persistent current in the molecule. Finally we return to the analysis of the molecule, now with your content of matter under rotation. For this, we studied a metric Gödel-type with spherical symmetry. We discussed the problem of causality and obtain the spectrum and the persistent current in terms of the vorticity (W) of spacetime.
Nesta tese estudamos a dinâmica de portadores de carga, e as propriedades eletrônicas, na molécula de fulerenoC60. Caracterizando-a por um viés geométrico. Tanto em sistemas de referência inercial, como quando temos seu conteúdo de matéria sob rotação. Inicialmente abordamos o advento científico das formas alotrópicas do carbono e a importância da modelagem a baixas energias dos seus derivados. Onde mostramos que no limite de baixas energias, o grafeno - que trata-se da forma alótropica bidimensional do carbono - pode ser descrito por uma teoria de férmions livres sem massa. Num segundo momento estendemos a teoria de férmions não massivos para a molécula de C60. Assumindo que a rede hexagonal do grafeno pode inscrever o C60 ao introduzirmos alguns defeitos topológicos. Um breve estudo sobre os defeitos topológicos na matéria condensada foi feito. Onde, logo em seguida, partimos para uma descrição de tais defeitos via uma geometria não-euclidiana. Mostrando como os portadores de carga no meio enxergam os defeitos como campos de gauge. Em seguida começamos a expor os resultados desta tese. Primeiramente assumimos tratar o fulereno por uma métrica de uma esfera bidimensional com defeitos, e contendo um monopolo de t’Hooft-Polyakov fictício em seu centro. O C60 é ainda submetido a ação de um fluxo de Aharonov-Bohm advindo de uma corda magnética quiral transpassando seus polos. Obtemos assim o espectro e a predição de uma corrente persistente na molécula. Por fim retomamos a análise da molécula, agora com seu conteúdo de matéria sob rotação. Para isso assumimos tratar o fulereno por uma métrica do tipo Gödel com simetria esférica. Discutimos o problema da causalidade e obtemos espectro e corrente persistente em termos da vorticidade (W) do espaço-tempo.
Dawson, Simon P. "Bounds on negative energy densities in quanum field theories on flat and curved space-times". Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437627.
Texto completo da fontePereira, Dante Donizeti. "Abordagem efetiva em teorias de campos: aspectos clássicos e quânticos". Universidade Federal de Juiz de Fora (UFJF), 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/4892.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Nesta tese exploramos diferentes aspectos de teorias clássicas e quânticas de campos. Na parte clássica, examinamos o fenômeno da birrefringência eletro-magneto-óptica em ele-trodinâmica não-linear no contexto de meios materiais dielétricos não-lineares como uma correção efetiva à teoria linear maxwelliana do eletromagnetismo. Na parte quântica, seguindo o método do heat kernel em teoria quântica de campos sobre espaços curvos, derivamos e estudamos a estrutura das divergências a 1-loop para a ação efetiva de diferentes modelos. Em particular, no ramo do modelo de Yukawa, exibimos duas novas formas de ambiguidades as quais tomam lugar na ação efetiva de campos fermiônicos através do fenômeno da anomalia multiplicativa não-local. Além disso, analisamos a estrutura das divergências ultravioletas a 1-loop para um modelo recentemente proposto de gravitação massiva livre de fantasmas, e mostramos que esse modelo encontra sérias dificuldades no nível quântico.
In this thesis we explore different aspects in classical and quantum field theories. In the classical part, we examine the phenomenon of electro-magneto-optical birefringence in nonlinear electrodynamics in the context of nonlinear dielectric media as an effective correction to the linear Maxwellian theory of electromagnetism. In the quantum part, following the heat kernel method in quantum field theory on curved spaces, we derive and study the structure of the 1-loop divergences for the effective action of different models. In particular, through the Yukawa model, we show two new forms of ambiguities which take place in the effective action of fermionic fields through the phenomenon of nonlocal multiplicative anomaly. Moreover, we analyzed the structure of ultraviolet divergences at 1-loop for a recently proposed ghost-free massive gravity model, and we show that this model meets serious difficulties at the quantum level.
Taslimitehrani, Mojtaba. "Aspects of Gauge Theories in Lorentzian Curved Space-times". 2018. https://ul.qucosa.de/id/qucosa%3A32454.
Texto completo da fonteKozoň, Marek. "Semiklasická energie eliptické Nambuovy-Gotovy struny". Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-392428.
Texto completo da fonteLivros sobre o assunto "Quantum space-times"
Feynman. New York: First Second, 2011.
Encontre o texto completo da fonteHawking, S. W. The illustrated A brief history of time. New York: Bantam Books, 1996.
Encontre o texto completo da fonteHawking, S. W. A brief history of time: From the big bang to black holes. Toronto: Bantam Books, 1988.
Encontre o texto completo da fonteHawking, S. W. A brief history of time: From the big bang to black holes. Oxford: ISIS Large Print, 1989.
Encontre o texto completo da fonteHawking, S. W. Shi jian jian shi: Cha tu ban. Changsha Shi: Hunan ke xue ji shu chu ban she, 2007.
Encontre o texto completo da fonteHawking, S. W. A brief history of time. New York: Bantam Books, 1998.
Encontre o texto completo da fonteHawking, S. W. A brief history of time: From the big bang to black holes. New York: Bantam Books, 1989.
Encontre o texto completo da fonteHawking, S. W. Kratka︠i︡a istori︠i︡a vremeni: Ot bolʹshogo vzryva do chernykh dyr. Sankt-Peterburg: Amfora, 2009.
Encontre o texto completo da fonteHawking, S. W. Dal Big Bang ai buchi neri. Milano: Rizzoli, 2000.
Encontre o texto completo da fonteHawking, S. W. A Brief History of Time: From the Big Bang to Black Holes. London, UK: Bantam Books Ltd, 1995.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Quantum space-times"
Ashtekar, Abhay. "Quantum Space-Times". In Minkowski Spacetime: A Hundred Years Later, 163–96. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3475-5_7.
Texto completo da fonteSanchez, N. "Quantum Strings in Curved Space Times". In NATO ASI Series, 265–315. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3814-1_10.
Texto completo da fonteRibeiro, Pedro Lauridsen. "Algebraic Holography in Asymptotically Simple, Asymptotically AdS Space-times". In Rigorous Quantum Field Theory, 253–70. Basel: Birkhäuser Basel, 2007. http://dx.doi.org/10.1007/978-3-7643-7434-1_18.
Texto completo da fonteRumpf, Helmut. "Quantum Field Theory in Non-globally Hyperbolic Space-Times". In Geometry and Quantum Physics, 400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46552-9_24.
Texto completo da fonteSánchez, Norma. "Field and String Quantization in Curved Space-Times". In Quantum Mechanics of Fundamental Systems 2, 203–29. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0797-6_13.
Texto completo da fonteAudretsch, Jürgen. "Mutually interacting quantum fields in curved space-times". In Field Theory, Quantum Gravity and Strings II, 68–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-17925-9_30.
Texto completo da fonteWilliams, Floyd. "Helmholtz Free Energy for Certain Negatively Curved Space-Times, and the Selberg Trace Formula". In Topics in Quantum Mechanics, 321–32. Boston, MA: Birkhäuser Boston, 2003. http://dx.doi.org/10.1007/978-1-4612-0009-3_17.
Texto completo da fonteAudretsch, Jürgen. "Mutually Interacting Quantum Fields in Curved Space-Times: The Outcome of Physical Processes". In NATO ASI Series, 233–64. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3814-1_9.
Texto completo da fonteGalimberti, Andrea. "FPGA-Based Design and Implementation of a Code-Based Post-quantum KEM". In Special Topics in Information Technology, 27–40. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51500-2_3.
Texto completo da fonteGuan, Ji, Wang Fang e Mingsheng Ying. "Verifying Fairness in Quantum Machine Learning". In Computer Aided Verification, 408–29. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13188-2_20.
Texto completo da fonteTrabalhos de conferências sobre o assunto "Quantum space-times"
Hiley, B. J. "Quantum Space-Times: An Introduction to “Algebraic Quantum Mechanics and Pregeometry”". In QUANTUM THEORY: Reconsideration of Foundations - 3. AIP, 2006. http://dx.doi.org/10.1063/1.2158734.
Texto completo da fonteCHAICHIAN, M., A. DEMICHEV e P. PREŠNAJDER. "QUANTUM FIELD THEORY ON NONCOMMUTATIVE SPACE-TIMES: THE RELATION BETWEEN ULTRAVIOLET BEHAVIOUR AND TOPOLOGY". In Proceedings of XIV Max Born Symposium. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793263_0004.
Texto completo da fontePlyavenek, A. G., e A. V. Lyubarjikii. "Carrier Capture and Escape in InGaAs/InGaAsP Quantum Well Lasers: Effect of Space Charge". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctuh4.
Texto completo da fonteWang, Yan. "Accelerating Stochastic Dynamics Simulation With Continuous-Time Quantum Walks". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59420.
Texto completo da fontePrevenslik, Thomas. "Heat Transfer in Nanoelectronics by Quantum Mechanics". In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73173.
Texto completo da fonteSlosser, John, T. A. B. Kennedy e P. Meystre. "Decay of number-state superpositions in a micromaser". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.ms3.
Texto completo da fonteNolte, D. D., R. M. Brubaker, M. R. Melloch, J. M. Woodall e S. J. Ralph. "High-density holographic storage based on nanometer-size arsenic clusters in GaAs". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tuvv7.
Texto completo da fonteJasmin, Serge, e Nakita Vodjdani. "Microwave Waveguide Photodiodes with Distributed Absorption for High Power Applications". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctho5.
Texto completo da fonteOberli, D. Y., J. Shah, T. C. Damen, C. W. Tu e D. A. B. Miller. "Electron Tunneling Times in Coupled Quantum Wells". In Quantum Wells for Optics and Opto-Electronics. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/qwoe.1989.wd3.
Texto completo da fonteMedlar, Michael P., e Edward C. Hensel. "Validation of a Physics Based Three Phonon Scattering Algorithm Implemented in the Statistical Phonon Transport Model". In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23307.
Texto completo da fonteRelatórios de organizações sobre o assunto "Quantum space-times"
Perdigão, Rui A. P. Strengthening Multi-Hazard Resilience with Quantum Aerospace Systems Intelligence. Synergistic Manifolds, janeiro de 2024. http://dx.doi.org/10.46337/240301.
Texto completo da fonte