Speaker
Description
Speaker: Rouzbeh Allaverdi
Abstract: We present a scenario where primordial black holes (PBHs) formed in a radiation-dominated (RD) phase undergo significant accretion during a period of early matter dominated (EMD), as a result of which their mass can grow by up to two orders of magnitude. Restricting to the linear perturbation regime, we compute the gravitational wave (GW) spectrum that features two peaks: a high-frequency peak associated with the PBH formation in the RD phase, and a low-frequency peak due to the sudden transition from EMD to the standard RD phase. We show that one or both peaks can be observed by a combination of different GW detectors for PBHs in the asteroid mass window, where they could comprise the totality of dark matter.