Academic literature on the topic 'Espace-temps quantiques'
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Journal articles on the topic "Espace-temps quantiques":
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.
Potvin, Jean. "La physique de la matière hadronique à haute température telle que décrite par la chromodynamique quantique sur réseau espace–temps." Canadian Journal of Physics 67, no. 12 (December 1, 1989): 1228–49. http://dx.doi.org/10.1139/p89-206.
Dissertations / Theses on the topic "Espace-temps quantiques":
Décanini, Yves. "Phénomènes de résonance et renormalisation en espace-temps courbe." Habilitation à diriger des recherches, Université Pascal Paoli, 2008. http://tel.archives-ouvertes.fr/tel-00609537.
Bogdanoff, Grichka. "Fluctuations quantiques de la signature de la métrique à l'échelle de Planck." Dijon, 1999. https://tel.archives-ouvertes.fr/tel-00001502.
XAVIER, GUIMARAES MARIA EMILIA. "Contributions a l'etude des champs quantiques en espace-temps conique et des solutions de type vortex couplees a la gravitation." Paris 6, 1996. http://www.theses.fr/1996PA066436.
Josset, Thibaut. "Vers une formulation covariante de la mécanique statistique." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0272.
According to general relativity, spacetime is not the absolute arena that Newton had imagined, where particles move, are created or annihilated. Instead, it is a dynamical object identified with the gravitational field, that possesses its own local degrees of freedom and, as such, can be subject to thermal fluctuations. A better understanding of the statistical properties of these local fluctuations would be highly relevant for early cosmology, quantum gravity, or the study of black holes. Unfortunately, the application of statistical mechanics ideas to relativistic systems faces a major conceptual difficulty: the absence of a preferred time. In this thesis, we present three approaches to covariant statistical mechanics. First, the thermal time hypothesis reverses the common logic and proposes the existence of a preferred time to be subsequent to the actual state of the system. An alternative path consists in extending the ergodic hypothesis of standard statistical mechanics to include time averages performed using internal clocks. Lastly, the idea that thermodynamics could find its origin at the microscopic scale in the entanglement of quantum systems is studied, the statistical state being then determined by the structure of the Hilbert space. In all cases, the notion of subsystem appears as the essential element to achieve a covariant formulation of statistical mechanics
Durbec, Amélia. "Dynamiques causales de graphes réversibles et quantiques." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0459.
Causal graph dynamics are a twofold extension of cellular automata: the underlying grid is extended to an arbitrary graph of bounded degree and the graph itself can evolve in time.In the reversible regime, we prove that causal graph dynamics can be reversible while creating/destroying vertices, through three different models that we prove to be equivalent.Based on these results, we exhibit causal dynamics that are both reversible and increasing in space, which brings new insights into the compatibility between the time arrow and reversibility. We define a notion of graph subshifts, which can be used to study causal dynamics of graphs by unifying temporal and spatial dimensions, in the same way that 1D cellular automata can be studied with 2D subshifts of finite type.In the quantum regime, our first contribution is to provide a rigorous definition of state space. A notable question was whether vertex names are necessary; we prove they are indeed necessary in order to prevent faster-than-light signaling. We also point out that renaming on graphs is the natively discrete analog of coordinate changes
Jian, Pu. "Limites quantiques dans les mesures de distance à l'aide de peignes de fréquences." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066574.
In many fields of physics, the determination of the space-time position of an object is performed at high levels of accuracy and precision by the exchange of light pulses. In this thesis, we investigate the quantum limits in a parameter estimation scheme using light in a practical point of view, and we study how these limits apply in a range-finding scheme using optical frequency combs. In a first part, we study the quantum limits in a general parameter estimation problem by the means of the quantum Cramér-Rao bound. We focus on schemes involving multimode Gaussian states and derive the limits of sensitivity in the estimation of any parameter encoded in such states. We show that a simple experimental setup allows to optimally measure the parameter carried by the light. In a second part, we study how these limits apply in a range-finding protocol using optical frequency combs. In a well-controlled environment such as vacuum, we show that there exists an optimal scheme, requiring pulse shaping techniques, which sensitivity is better than the usual phase interferometry and time-of-flight measurements. We present experimental results that exhibits the standard quantum limit in space-time positioning. In the last part, we study the limitations introduced to this optimal scheme when the environment is weakly dispersive, like in air. We demonstrate that the loss of accuracy caused by such environmental fluctuations can be compensated at the expense of a reduced sensitivity. We propose an experimental scheme that allows to perform a real-time ranging measurement immune from atmospheric perturbations, without any knowledge of the values of the environmental parameters
Ben, Cheikh Harrek Zouhour. "Étude des ondes de spin dans des puits quantiques CdMnTe." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20071/document.
This thesis focuses on the study of spin waves in n-doped CdMnTe quantum wells using respectively time-resolved Kerr rotation (TRKR) and four-wave mixing (FWM) techniques. We studied three high mobility samples with different characteristics.The TRKR technique gives access only to zero wave vector excitations, in our case the spin- flip wave q = 0 . We studied the anticrossing that appears between the spin -flip wave and the manganese spin -flip excitation. We studied the gap variation energy between these modes as function on the power excitation and the magnetic field. In particular, we have extended the measurements of mixed modes at lower Mn concentration (up 0.07 %) and contrary to what were expected; we found that the strong coupling regime persists at this concentration.We are then interested in determining the two dimensional electron gas spin polarization ζ, which can be deduced from the energy coupling between the mixed modes. We found that the measured polarization exceeds the theoretical polarization calculated taking into account the increased susceptibility by many-body effects. We also measured the electron spin relaxation time and we have shown that it is influenced by thermal effects inherent to optical pump-probe experiments on this time.In the second part of this thesis, we studied by FWM the damping and the dispersion of the non-zero wave vector spin waves for one of our samples. We have demonstrated that we can actually generate spin waves in femtosecond excitation and deted them by FWM. We found that the dispersion is lower than that observed in the Raman experiments. This low dispersion may be due to the strong excitation density used in the FWM experiments (typically three to four orders of magnitude higher than the Raman ones) and / or the fact that two waves of wave vector q and - q, having different dispersions are simultaneously probed in FWM
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
Viet, Dang Nguyen. "Renormalisation de la théorie quantique des champs en espace-temps courbes: une approche causale." Phd thesis, Université Paris-Diderot - Paris VII, 2013. http://tel.archives-ouvertes.fr/tel-00918759.
Queva, Julien. "Interaction en Espace-temps de de Sitter : sur quelques problèmes de quantification: en espace-temps de de Sitter et par états cohérents." Phd thesis, Université Paris-Diderot - Paris VII, 2009. http://tel.archives-ouvertes.fr/tel-00503186.
Books on the topic "Espace-temps quantiques":
Bacry, Henri. Localizability and space in quantum physics. New York: Springer, 1988.
Bojowald, Martin. L'univers en rebond: Avant le big-bang. Paris: Albin Michel, 2011.
Zeh, H. D. The physical basis of the direction of time. 4th ed. Berlin: Springer, 2001.
Zeh, H. D. The physical basis of the direction of time. 3rd ed. Berlin: Springer, 1999.
Zeh, H. D. The physical basis of the direction of time. 2nd ed. Berlin: Springer-Verlag, 1992.
Zeh, H. D. The physical basis of the direction of time. 5th ed. Berlin: Springer, 2007.
Zeh, H. D. The Physical Basis of the Direction of Time. Berlin: Springer-Verlag, 1989.
Zeh, H. D. The physical basis of the direction of time. 5th ed. Berlin [u.a.]: Springer Verl., 2010.
Zeh, H. D. The Physical Basis of the Direction of Time. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989.
Zeh, H. D. The physical basis ofthe direction of time. 2nd ed. Berlin: Springer-Verlag, 1992.