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08/11/2023 08:45
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Maxime JACQUET (Laboratoire Kastler Brossel, Sorbonne Université et CNRS), M. Scott Robertson (CNRS (Institut Pprime)), Germain ROUSSEAUX (CNRS (Institut Pprime))08/11/2023 09:00
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Jérôme Martin (IAP)08/11/2023 09:10
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Giorgio Ciliberto (LPTMS, Paris-Saclay University)08/11/2023 10:10
In this talk I will present several measures of entanglement in an acoustic black hole realized in the flow of a Bose-Einstein condensate. I will specifically address (1) the resilience of the signal to a finite temperature and (2) how the specifics of the setting we consider enable to study tripartite observables of nonlocality.
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08/11/2023 10:55
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Germain ROUSSEAUX (CNRS)08/11/2023 11:15
In this talk, we introduce several analogies between classical mechanics (including hydrodynamics) and cosmology. In particular, we show that the Friedman-Lemaître set of equations at the theoretical roots of the description of the Universe Expansion can be written in a mathematical form akin to the Rayleigh-Plesset equation which rules the dynamics of a bubble in a liquid. Hence the ratio...
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08/11/2023 12:00
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Maxime JACQUET (Laboratoire Kastler Brossel, Sorbonne Université et CNRS)08/11/2023 14:00
QFT on curved geometries has predicted a number of pair-emission processes like rotational superradiance. These occur when the acoustic field in a quantum fluid scatters on some intangible surface of the fluid. For example, superradiance results from the scattering of acoustic waves (possibly in their vacuum state) at the surface where the total velocity of the fluid exceeds the speed of...
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Alexis Bossard (Université de Poitiers (Institut Pprime))08/11/2023 14:45
The black hole LASER effect is a theoretical prediction in General Relativity proposed by Vilenkin in 1978 for one horizon [1] and rediscovered in Analogue Gravity by Corley and Jacobson in 1999 for two horizons [2]. According to them, the superadiance effect (with rotation) or Hawking effect (without rotation) could be amplified by a "laser cavity" formed by either one horizon (a...
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08/11/2023 15:30
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Alessia Biondi (Università di Pisa)08/11/2023 15:50
In this talk, we introduce a novel method for building an analog model with a Bose-Einstein condensate, in which the analogue metric is obtained using an effective field theory and a microscopic Lagrangian with a quartic interaction. The microscopic Lagrangian that we introduce is obtained first assuming that our system is described by a complex massive scalar field, and and then requiring...
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Dimitrios Kranas (LPENS, ENS Paris)08/11/2023 16:10
The entanglement shared by the emitted particle fluxes is the very quantum signature of the Hawking process. Stimulated and spontaneously generated Hawking radiation has been experimentally investigated in several platforms, but measuring entanglement has proven to be elusive, due to its faint and fragile character. In this talk, I will discuss the main results of my work on optical analog...
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Tangui Aladjidi (LKB)08/11/2023 16:30
Hot atomic vapors are widely used in non-linear and quantum optics due to their large Kerr non-linearity. This non-linearity induces effective photon-photon interactions allowing light to behave as a fluid displaying quantum properties such as superfluidity. Quantum fluids of light rely on the analogy between the non-linear Schrödinger equation (NLSE) describing the propagation of light in...
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Jean-Paul Martischang (Université de Lille)08/11/2023 16:50
The intricacy of general relativity has fostered the creation of numerous simplified models and representations, that are founded on the principle of a stretched membrane distorted by bodies moving on its surface. However, an inherent limitation in these systems is that these bodies are solid discrete masses, hence limiting their potential for representing complex merging dynamics like those...
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Dmitry Solnyshkov (Université Clermont Auvergne)09/11/2023 09:00
We study the effects of the wavevector-dependent losses on polariton condensates. We demonstrate that because of these losses, a single vortex becomes a center of a convergent flow, which allows describing it by an analogue Kerr black hole metric with a dynamically evolving origin. For a pair of vortices, we find an analogue of the 3rd Kepler's law and estimate the emission rate of the...
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Scott Robertson (CNRS (Institut Pprime))09/11/2023 09:45
The Analogue Gravity program has had considerable success recently, with ultracold gases playing a particularly prominent role as a system in which quantum aspects of field theory in curved spacetime can be explored. In this talk, I will present the analogy between a modulated 1D condensate and the preheating stage of cosmology, whereby a large number of quasiparticle pairs are excited out of...
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09/11/2023 10:30
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Victor Gondret (Institut d'Optique Graduate School)09/11/2023 10:50
In standard cosmological models, inflation is driven by a quantum field, the inflaton, whose constant energy density drives the superluminal expansion of the universe. When inflation stops, the universe has an extremely low density but the inflaton field starts to oscillate around its minimum of energy and decays into entangled pairs of particles. This is known as the pre-heating phase....
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09/11/2023 11:35
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09/11/2023 12:20
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