Seminarium "Teoria cząstek elementarnych i kosmologia"

Primordial black holes (PBHs) can generically form through the collapse of enhanced cosmological perturbations, constituting in some specific mass ranges a viable candidate for dark matter. Interestingly enough, the enhanced cosmological perturbations which collapse to form PBHs as well as the PBH energy density perturbations themselves can produce a stochastic gravitational-wave (GW) background induced by second-ordergravitational interactions, which can be detectable in GW observatories. In this talk, afterintroducing initially the motivation for the physics of PBHs and the associated to them GWsignals I will focus afterwards on the ultra-light PBH mass range and its induced GWsignatures through which one can probe the physics of the primordial Universe, theunderlying gravity theory testing as well fundamental high-energy physics theories.