Fakultät für Physik und Astronomie

Primordial black hole formation in F(R) bouncing cosmology

Shreya Banerjee , University of Erlangen–Nuremberg

The phenomenology of primordial black holes (PBHs) physics, and the associated PBH abundance constraints, can be used in order to probe the early-universe evolution. In this talk, we focus on the bounce realization within F(R) modified gravity and we investigate the corresponding PBH behavior. In particular, we calculate the energy density power spectrum at horizon crossing time as a function of the involved theoretical parameters, and then we extract the PBH abundance in the context of peak theory, considering the non-linear relation between the density contrast and the comoving curvature perturbation, as well as the critical collapse law for the PBH masses. We calculate the PBH mass function, and the PBH abundance at formation time as a function of the model parameters, namely the bounce parameter and the Hubble parameter at the transition time from the bounce to the radiation dominated epoch. Upon full parameter analysis, we obtain very interesting constraints on the model parameters leading to significant PBH production.

Kosmologie und Elementarteilchenphysik
5 Jul 2022, 15:00
Institut für Theoretische Physik, Phil19

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