Contemporary gravitational waves from primordial black holes

Abstract

Stochastic background of gravitational waves (GW) generated by the interactions between primordial black holes (PBH) in the early universe and by PBH evaporation is considered. If PBHs dominated in the cosmological energy density prior to their evaporation, GWs from the earlier stages (e.g. inflation) would be noticeably diluted. On the other hand, at the PBH dominance period they could form dense clusters where PBH binary formation might be significant. These binaries would be efficient sources of the gravitational waves.

8 pages, presented at Les Rencontres de Physique de la Vallée d'Aoste. La Thuile 2011, to be published in Il Nuovo Cimento Results and Perspectives in Particle Physics