Speaker
Description
A gas of Poisson distributed primordial black holes (PBH) can induce at second order in cosmological perturbation theory a stochastic gravitational-wave (GW) background. This GW background can act as a novel method to extract constraints on cosmological models and gravitational theories. In this talk, we will discuss the above mentioned GW portal within the context of general relativity by accounting as well for the effect of realistic extended PBH mass functions and checking its potential detectability by GW experiments. Interestingly, by requiring not to have GW overproduction we set model-independent constraints the initial PBH abundance at PBH formation time as a function their mass. Finally, we study the aforementioned GW signal within the context of f(R) modified theories of gravity showing that it can serve as a novel probe constraining the underlying gravity theory.
