Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-ph
Date Vendredi 17 Mai 2019
Heure 14:00
Institut LPTHE
Salle library
Nom de l'orateur Laha
Prenom de l'orateur Ranjan
Addresse email de l'orateur
Institution de l'orateur CERN
Titre Gravitational wave astroparticle physics
Résumé The direct detection of gravitational waves have opened up a new way to probe the Universe. In this talk, I will discuss two different examples of how this discovery can motivate studies in various directions in astroparticle physics. In the first part of the talk, we explore in detail the possibility that gravitational wave signals from binary inspirals are affected by a new force that couples only to dark sector particles. We discuss the impact of both the new force acting between the binary partners as well as radiation of the force carrier. We show that any deviation from the predictions of general relativity observed in binary inspirals must be due either to the material properties of the inspiraling objects themselves, such as a tidal deformability, to a true fifth force coupled to baryons, or to a non-standard production mechanism for the dark sector cores of neutron stars. In the second part of the talk, we will discuss the lensing of fast radio bursts as a probe of primordial black holes and exotic compact boson stars and fermion stars. The presence of a compact object near the line of sight produces two images of the radio burst. If the images are sufficiently separated in time, this technique can constrain the presence of primordial black holes and other exotic compact objects. This technique has the potential to provide leading constraints over a wide range of masses \gtrssim 10 Msolar.
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