## Chercheurs :

*Sergey Solodukhin, Loïc Villain, Clément Berthiere*

## Présentation :

Research themes of this group mainly focus on macroscopic objects whose description involves a relativistic theory of gravitation. **Sergey Solodukhin** works on properties of black holes and gravitational waves in general relativity and alternative theories**.** One of his common topics of interest is black hole entropy (its microscopic origin, its relation with entanglement entropy, etc.). **Loïc Villain**'s work concentrates on relativistic astrophysics, especially on the so-called "compact objects" (neutron stars and astrophysical black holes) and on "numerical relativity" (numerical solving of the Einstein equations). In relation with those subjects, he collaborates with researchers of *LUTH (UMR 8102, Observatoire de Paris-Meudon)*, a laboratory to which he is an associate researcher, on relativistic (magneto)hydrodynamics and its observational signatures for compact objects (gravitational waves, neutrinos from supernovae, gamma ray emission from magnetars, etc.).