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Статті в журналах з теми "Phénoménologie de la gravité quantique":
Sénéchal, David. "Gravité quantique et modèles de matrices." Canadian Journal of Physics 69, no. 7 (July 1, 1991): 837–54. http://dx.doi.org/10.1139/p91-138.
Tilloy, Antoine. "Et si la gravité n’était pas quantique ?" Pour la Science N° 495 - janvier, no. 1 (January 1, 2019): 28–37. http://dx.doi.org/10.3917/pls.495.0028.
Vicari, Fernand. "Par-delà le visible, la réalité du monde physique et la gravité quantique." Hegel N° 2, no. 2 (2015): 167. http://dx.doi.org/10.3917/heg.052.0167.
Rosanvallon, Jérôme. "Variation sans temps. Une contribution à la métaphysique de la gravité quantique – 1/2." Rue Descartes N° 100, no. 2 (November 5, 2021): 119–27. http://dx.doi.org/10.3917/rdes.100.0119.
Rosanvallon, Jérôme. "Variation sans temps. Une contribution à la métaphysique de la gravité quantique 2/2." Rue Descartes N° 101, no. 1 (April 5, 2022): 132–47. http://dx.doi.org/10.3917/rdes.101.0132.
Gibeault, Alain. "Théorie de la connaissance et théorie du fonctionnement mental. Réflexions sur la fécondation réciproque entre philosophie et psychanalyse." Revue française de psychanalyse Vol. 88, no. 2 (April 30, 2024): 149–59. http://dx.doi.org/10.3917/rfp.882.0149.
Araújo, Leonardo Oliveira de. "Un univers discret comme proposition d'unification de la physique." Revista Científica Multidisciplinar Núcleo do Conhecimento, February 10, 2022, 122–38. http://dx.doi.org/10.32749/nucleodoconhecimento.com.br/fisica-fr/dunification-de-la-physique.
Fernand Vicari. "Par delà le visible, la réalité du monde physique et la gravité quantique de Carlo Rovelli." HEGEL - HEpato-GastroEntérologie Libérale, no. 2 (2015). http://dx.doi.org/10.4267/2042/56647.
Дисертації з теми "Phénoménologie de la gravité quantique":
Linsefors, Linda. "Phénoménologie de la cosmologie quantique à boucles." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY009/document.
Loop quantum gravity (LQG) is an attempt to solve the problem of quantum gravity. Loop quantum cosmology (LQC) is an attempt to apply LQG to early cosmology. The purpose of LQC is to connect LQG with observations. It is very hard to observe any quantum gravity effects because enormous energy density is most likely required. This is exactly why the early Universe is chosen as a stage to search for quantum gravity phenomena.The central result of LQC is that the big bang singularity is replaced by a big bounce. However this is not something that is possible to observe today. For this reason, we have investigated how cosmic perturbations are affected by LQC. We have used the so called deformed algebra approach, and have calculated the resulting spectrums for both scalar and tensor perturbations.The spectrums that we have found are not compatible with observation. However this can not bee taken as very strong evidence against LQG since there are too many assumptions on the way. Rather this is a result for this specific interpretation of LQC.We have also studied the background dynamics (the homogenous part of the equations) of LQC. Since slow-roll inflation is essential in explaining many features of the universe, including the CMB, we want to know if slow-roll inflation is compatible with LQC. We have found that, indeed, it is. If a square potential inflation field is added to the theory, the bounce will lift the potential energy enough to provide around 145 e-folds of slow-roll inflation. However, when anisotropies are taken into account, the amount of inflation decreases, and can even disappear completely if there is too much shear at the time of the bounce.We have derived the modified Friedman equation for anisotropic LQC. This has allowed us to study anisotropic LQC not just numerically, but also analytically, which has given us a much more comprehensive understanding of the situation than what was known before.Finally, we have studied some geometric aspects of de Sitter space, which has resulted in two very different considerations. Firstly we found that we can, for a general theory of modified cosmology and under some quite conservative assumptions, derive the dynamics for a spatially curved universe, given the dynamics of a spatially flat one. This is relevant in theories such as LQC, where it is easier to find the flat solution than the curved one. Secondly, we propose a possible mechanism for the origin and rebirth of the Universe
Coutant, Antonin. "phénoménologie de la gravité quantique : Propriété de stabilité de la radiation d'Hawking en présence de violation de l'invariance local de Lorentz." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00747874.
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.
Noncommutative 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
Girelli, Florian. "Géométrie non commutative et gravité quantique." Aix-Marseille 1, 2002. http://www.theses.fr/2002AIX11039.
Zhang, Mingyi. "Gravité quantique à boucles et géométrie discrète." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4027/document.
In this thesis, I will present how to extract discrete geometries of space-time fromthe covariant formulation of loop quantum gravity (LQG), which is called the spinfoam formalism. LQG is a quantum theory of gravity that non-perturbative quantizesgeneral relativity independent from a fix background. It predicts that the geometryof space is quantized, in which area and volume can only take discrete value. Thekinematical Hilbert space is spanned by Penrose's spin network functions. The excita-tion of geometry can be neatly visualized as fuzzy polyhedra that glued through theirfacets. The spin foam defines the dynamics of LQG by a spin foam amplitude on acellular complex, bounded by the spin network states. There are three main results inthis thesis. First, the semiclassical limit of the spin foam amplitude on an arbitrarysimplicial cellular complex with boundary is studied completely. The classical discretegeometry of space-time is reconstructed and classified by the critical configurations ofthe spin foam amplitude. Second, the three-point function from LQG is calculated.It coincides with the results from discrete gravity. Third, the description of discretegeometries of null hypersurfaces is explored in the context of LQG. In particular, thenull geometry is described by a Euclidean singular structure on the two-dimensionalspacelike surface defined by a foliation of space-time by null hypersurfaces. Its quan-tization is U(1) spin network states which are embedded nontrivially in the unitaryirreducible representations of the Lorentz group
Wieland, Wolfgang. "Structure chirale de la gravité quantique à boucles." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4094/document.
General relativity is the most precise theory of the gravitational interaction. It is a classical field theory. All matter, on the other hand, follows the rules of quantum theory. At the Planck scale, at about distances of the order of 10E-35 meters, both theories become equally important. Today, theoretical physics lacks a unifying language to explore what happens at this scale, but there are several candidate theories available. Loop quantum gravity is one them, and it is the main topic of this thesis. To see whether a particular proposal is a viable candidate for a quantum theory of the gravitational field it must be free of internal inconsistencies, and agree with all experimental tests of general relativity. This thesis develops mathematical tools to check these
Christodoulou, Marios. "Transition de géométrie en gravité quantique à boucles covariante." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0273.
In this manuscript we present a calculation from covariant Loop Quantum Gravity, of a physical observable in a non-perturbative quantum gravitational physical process. The process regards the transition of a trapped region to an anti--trapped region and is treated as a quantum geometry transition akin to gravitational tunneling. The physical observable is the characteristic timescale in which the process takes place. We start with a top--to--bottom formal derivation of the ansatz defining the amplitudes for covariant LQG, starting from the Hilbert-Einstein action. We then take the bottom--to--top path, starting from the EPRL ansatz, to the sum--over--geometries path integral emerging in the semi-classical limit, and discuss its close relation to the naive path integral over the Regge action. We proceed to the construction of wave--packets describing quantum spacelike three-geometries that include a notion of embedding in a Lorentzian spacetime. We derive a simple estimation for the amplitudes describing geometry transition and show that a probabilistic description for such phenomena emerges, with the probability of the phenomena to take place being in general non-vanishing.The Haggard-Rovelli spacetime, modelling the spacetime surrounding the geometry transition region for a black to white hole process, is formulated. We then use the semi--classical approximation to give a general estimation of amplitudes describing the process. We conclude that the transition is predicted to be allowed by LQG, with a crossing time that is linear in the mass. The probability for the process to take place is suppressed but non-zero
Louapre, David. "Modèles de mousses de spin pour la gravité quantique en 3 dimensions." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2004. http://tel.archives-ouvertes.fr/tel-00337352.
Noui, Karim. "Gravitation quantique et groupes quantiques." Montpellier 2, 2003. http://www.theses.fr/2003MON20080.
Regnault, Nicolas. "Solutions exactes de la gravité réduite : effet Hall quantique de spin." Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00001360.
Книги з теми "Phénoménologie de la gravité quantique":
Moffat, John W. Reinventing gravity: A physicist goes beyond Einstein. Toronto: Thomas Allen Publishers, 2009.
Vega, H. J. de 1949- and Sanchez N. 1952-, eds. Field theory, quantum gravity, and strings II: Proceedings of a seminar series held at DAPHE, Observatoire de Meudon, and LPTHE, Université Pierre et Marie Curie, Paris, between October 1985 and October 1986. Berlin: Springer-Verlag, 1987.
Buchbinder, I. L. Effective action in quantum gravity. Bristol: Institute of Physics Publishing, 1992.
McTaggart, Lynne. The field: The quest for the secret force of the universe. New York: Quill, 2003.
Mctaggart, Lynne. The Field. New York: HarperCollins, 2007.
Bojowald, Martin. L'univers en rebond: Avant le big-bang. Paris: Albin Michel, 2011.
Hatfield, Brian. Feynman Lectures on Gravitation. Westview Press, 2002.
Hatfield, Brian, Fernando B. Morinigo, Richard Phillips Feynman, and William G. Wagner. Feynman Lectures on Gravitation. Penguin Books, Limited, 1999.
Physics Meets Philosophy at the Planck Scale: Contemporary Theories in Quantum Gravity. Cambridge University Press, 2001.
(Editor), Craig Callender, and Nick Huggett (Editor), eds. Physics Meets Philosophy at the Planck Scale. Cambridge University Press, 2001.
Частини книг з теми "Phénoménologie de la gravité quantique":
Rovelli, Carlo. "Séance X. La gravité quantique à boucles." In Le monde quantique, 407. Editions Matériologiques, 2014. http://dx.doi.org/10.3917/edmat.zwirn.2014.01.0407.
"La gravité quantique : la fin du temps ?" In Le temps en images, 164. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1694-1-104.
"La gravité quantique : la fin du temps ?" In Le temps en images, 164. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1694-1.c104.
Bihan, Baptiste Le. "Théorie des cordes, gravité quantique à boucles et éternalisme." In La métaphysique du temps : perspectives contemporaines. Collège de France, 2021. http://dx.doi.org/10.4000/books.cdf.10849.