Théorie

Exploring extreme phases of matter using the holographic correspondence.

RESEARCH THEME: Using the AdS/CFT correspondence to study phases of gauge theories, at strong coupling at finite temperature and density. A related problem is to understand the physics of cold nuclear matter at the center of neutron stars..

RESEARCH GROUP in the Laboratory : APC, Theory

Neutrinos: from the discovery of the diffuse supernova background to entanglement

Neutrinos are elementary massive particles with mixings. They can change flavor while propagating. Weakly interacting, neutrinos tell us about the primordial Universe and dense environments, such as exploding stars (core-collapse supernovae) or binary compact objects (neutron star-neutron star, black hole-neutron star). Such neutrinos undergo unexpected flavor phenomena and can be unique probes for new physics.

Lancement d'ACME, un projet construit par et pour les communautés des astroparticules et de l'astronomie

Les 16 et 17 septembre s'est tenue à Paris la réunion de lancement du Astrophysics Centre for Multimessenger studies in Europe - ACME. Ce projet HORIZON-INFRA-2023-SERV-01 financé par l'UE et coordonné par le Centre national de la recherche scientifique CNRS vise à réaliser une ambitieuse optimisation coordonnée à l'échelle européenne de l'accessibilité et de la cohésion entre plusieurs infrastructures de recherche de pointe en matière d'astroparticules et d'astronomie, offrant un accès aux instruments, aux données et à l’expertise, axés sur la nouvelle science de l'astrophysique multi-messagers.

SN1987A: nouvelle limite sur la désintégration non-radiative des neutrinos

Deux membres de l'APC publient un article dans la revue Physics Letters B présentant la toute première analyse de likelihood des 24 évènements neutrinos de la SN1987A, incluant la désintégration non-radiative des neutrinos.

Neutron star physics, neutron star mergers, near-extremal black holes and effective theories near absolute zero.

This project involves using techniques from the AdS/CFT correspondence (known also as holography) to understand

(a) The non-trivial phases in the QCD phase diagram, involving non zero baryon number density as well as non-zero isospin density.

(b) The statics and dynamics in non-trivial phases relevant for neutron stars, where very low temperatures are relevant.

The holographic solutions dual to such phases involve near-extremal black holes that have unusual features compared to standard black holes: although for such solutions hydrodynamics

Dynamique des systèmes binaires en relativité générale et perturbations des trous noirs en gravité modifiée

La relativité générale est une théorie plus que centenaire qui a survécu, jusqu’à présent, à toutes les mises à l’épreuve observationnelles. Avec les détections des ondes gravitationnelles émises par des coalescences de trous noirs ou d’étoiles à neutrons s’amorce une nouvelle étape dans l’histoire de la relativité générale : l’ère de l’astronomie gravitationnelle.

Aspects of Holographic Quantum Field Theories on Curved Spacetimes

The thesis will focus on the study of the properties of holographic quantum field theories on curved background, with the applications to cosmology and to quantum field theories with defects.

Neutrinos: from the discovery of the diffuse supernova background to entanglement

Neutrinos are elementary massive particles with mixings. They change their flavor while propagating. The vacuum oscillations discovered in 1998 by the Super-Kamiokande Collaboration is a breakthrough, with an impact in particle physics, astrophysics and cosmology.

Non-linear aspects and symmetries of black hole perturbation theory

The thesis will study theoretical aspects and symmetries of black hole perturbation theory, with applications to future gravitational-wave observations.

MULTI-MESSENGER ASTRONOMY AT THE HIGHEST ENERGY FRONTIER

The discovery of astrophysical neutrino signal by IceCube neutrino telescope has extended the energy frontier of astronomy into Peta-electronvolt energy range. The nature of astronomical sources is currently uncertain. A breakthrough toward understanding of the nature of these sources can be achieved via detection of the gamma-ray counterpart of the astrophysical neutrino signal. Gamma-ray signal at 100 TeV is now detectable by the HAWC, Tibet and LHAASO telescopes. Further powerful observational facilities, like CTA and SWGO telescopes are under construction or planned.

Théorie