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The organizers04/10/2022 10:20
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Sylvain Marsat (L2I Toulouse, CNRS/IN2P3)04/10/2022 10:30
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Aurelien Hees (SYRTE - Observatoire de Paris)04/10/2022 11:10
The Space Time Explorer and QUantum Equivalence principle Space Test (STE-QUEST) is a M-class mission proposal that has recently been submitted to the M7 call in ESA's science program. This proposal has successfully passed the phase 1 selection and is currently under investigation for the phase 2. STE-QUEST will provide an atom interferometric measurement of the universality of free fall in...
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Dr Maxime Jacquet (Laboratoire Kastler Brossel, CNRS France)04/10/2022 11:35
Vacuum quantum fluctuations near horizons are known to yield correlated emission by the Hawking effect. We use a driven-dissipative quantum fluid of microcavity polaritons as an analog model of a quantum field theory on a black-hole spacetime and numerically calculate correlated emission. We show that, in addition to the Hawking effect at the sonic horizon, quantum fluctuations may result in a...
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Francesca Gulminelli (LPC/Ensicaen)04/10/2022 14:00
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Adrien Kuntz (Scuola Normale Superiore)04/10/2022 14:40
Three-body systems are very common in the universe and it is likely that future gravitational-wave detectors will detect and measure the parameters of such systems. I will describe an interesting relativistic resonance taking place in hierarchical three-body systems when the precession frequency of an inner binary black hole matches the period of an outer perturber object. I will show how this...
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Alejandro Perez (Centre de Physique Theorique)04/10/2022 15:05
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Sergei Alexandrov (CNRS, Montpellier University)04/10/2022 15:45
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Francesco Nitti (APC, Université de Paris)04/10/2022 16:55
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Valentin Nourry (APC, Université de Paris)04/10/2022 17:35
Maximally symmetric spacetimes are well known to be stable under small metric perturbations if they propagate into the vacuum. But this statement is not always verified in the presence of matter.
Starobinsky inflation is based on the idea that a quantum Conformal Field Theory (CFT) backreacts in an initial de Sitter spacetime, driving it to a FLRW spacetime after a period of...
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Patrick Peter (CNRS)05/10/2022 09:00
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Dr Severin Lüst (Harvard University)05/10/2022 09:40
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Lucas Pinol (Instituto de Física Teórica (IFT), UAM-CSIC, Madrid)05/10/2022 10:50
Notoriously, scalar primordial non-Gaussianities constitute a key prediction of the inflationary paradigm that is yet to be discovered. Less famous, tensor non-Gaussianities as well as mixed scalar-tensor non-Gaussianities may also arise from non-linear interactions in the early Universe.
In this talk, I will explain how the latter types of bispectra (the three-point functions) may be...
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Denis Werth (Sorbonne University -- IAP)05/10/2022 11:15
Inflation is a widely accepted paradigm explaining the origin of the observed spatial correlation in cosmological structures. However, the physics of inflation remains elusive, and a key challenge of primordial cosmology is to decipher it through the study of cosmological correlators, which notably encode high-energy physics effects during inflation. Both on theoretical and practical grounds,...
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Thomas Colas (IAS/APC)05/10/2022 11:40
Nearly scale-invariant, Gaussian and adiabatic scalar perturbations from quantum mechanical origin have been extensively tested using CMB and LSS data. Effective field theories aim at providing a systematic way to consider extensions to this adiabatic evolution, incorporating the knowledge of unknown physics in a parametrically controlled manner. In order to grasp the implications of some...
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Simon Cléry (IJCLab - Pôle théorie)05/10/2022 13:45
We present new results on gravitational matter production in the late time evolution of inflation, during coherent oscillation regime of the inflationary field, usually called "reheating". We consider the production of matter and radiation during reheating after inflation, restricting our attention to gravitational interactions, including minimal and non-minimal coupling to gravity. In...
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Mathias Pierre (DESY)05/10/2022 14:10
In this talk I will discuss the production of scalar dark matter from the inflaton condensate during inflation and reheating. I will discuss the production regimes assuming that this scalar couples to the inflaton via a direct quartic coupling and gravity: purely gravitational, weak direct coupling (perturbative), and strong direct coupling (nonperturbative). For each regime, I will determine...
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Dr Gaétan Facchinetti (Université Libre de Bruxelles)05/10/2022 14:35
Observations of the 21 cm line of atomic hydrogen with radio telescopes will provide an unparalleled probe of the Universe between reionization ($z\sim$ 6-12) and cosmic dawn ($z\simeq$ 30). Because exotic energy injection in the intergalactic medium via dark matter decay or annihilation can be particularly efficient in that redshift range (due to a long lifetime or clustering into halos), the...
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Cyril PITROU ({CNRS}UMR7095)05/10/2022 15:00
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Pasquale Dario Serpico (LAPTh, Annecy-le-vieux), Vincent Vennin (LPENS)05/10/2022 16:10
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federico piazza (CPT, Marseille)05/10/2022 16:25
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Dr Pierre Boldrini (IAP/INRIA Nancy)05/10/2022 17:05
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Théo SIMON (Montpellier Universe and Particles Laboratory - CNRS)05/10/2022 17:30
In this talk, I will present the first constraints on decaying cold dark matter (DCDM) models thanks to the effective field theory of large scale structure (EFTofLSS) applied to BOSS-DR12 data. I will consider two phenomenological models of DCDM: i) a model where a fraction $f_{\rm dcdm}$ of cold dark matter (CDM) decays into dark radiation (DR) with a lifetime $\tau$; ii) a model (recently...
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Benoit Famaey (CNRS Observatoire astronomique de Strasbourg)06/10/2022 09:00
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Christian Marinoni (Centre de Physique Théorique, Marseille)06/10/2022 09:40
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Karsten Jedamzik (LUPM University of Montpellier)06/10/2022 10:50
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Francesca Scarcella (LUMP)06/10/2022 11:30
Black holes formed in the early Universe (PBHs) could constitute (a component of) the dark matter. In this talk I will consider primordial black holes (PBHs) of O(1) - O(100) solar masses. First, I will discuss the possibility of detecting PBHs in the Milky Way through the process of gas accretion, presenting a comprehensive study of the uncertainties associated to this observation channel....
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Jordan Gué (SYRTE, Observatoire de Paris)06/10/2022 11:55
In this paper, we present an experiment based on 1) the application of a strong electric field inside a microwave cavity and 2) electrometry using Rydberg atoms. This kind of experiment could be extremely useful at detecting dark photons through the stationary electric field filling the whole space it induces. The sensitivity of this experiment is significantly enhanced around the resonances...
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Clément Stahl (ObAS)06/10/2022 13:45
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Raquel Galazo-Garcia (IPhT - CEA)06/10/2022 14:10
Fuzzy Dark Matter (FDM) models admit self-similar solutions which are very different from their Cold Dark Matter (CDM) counterparts and do not converge to the latter in the semiclassical limit. In contrast with the familiar CDM hierarchical collapse, they correspond to an inverse-hierarchy blow-up. Constant-mass shells start in the nonlinear regime, at early times, with small radii and high...
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Alexis Boudon (Institut de Physique Théorique - CEA, Saclay)06/10/2022 14:35
We investigate the flow around a black hole moving through a cloud of self-interacting scalar dark matter. We focus on the large scalar mass limit, with quartic self-interactions, and on the subsonic regime. We show how the scalar field behaves as a perfect gas of adiabatic index $\gamma_{\rm ad}=2$ at large radii while the accretion rate is governed by the relativistic regime close to the...
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Olivier Minazzoli (ARTEMIS - OCA)06/10/2022 15:00
In this talk I will present the fact that the quantum field theory treatment of entangled relativity requires the existence of a new fundamental quantum of action that is not the usual constant of Planck (hbar). Instead, in entangled relativity, hbar can be thought to be an effective late times and low energy limit quantum of action, which therefore depends on the spacetime localisation. I...
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The Organizers06/10/2022 15:25
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TBA
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Eugeny Babichev (LPT Orsay)
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Dr Pierre-Henri Chavanis (LPT-Toulouse)
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