Solar-Mass Primordial Black Holes Explain NANOGrav Hint of Gravitational Waves
arXiv:2009.11853 · doi:10.1016/j.physletb.2020.136040
Abstract
The NANOGrav collaboration for the pulsar timing array (PTA) observation recently announced evidence of an isotropic stochastic process, which may be the first detection of the stochastic gravitational-wave (GW) background. We discuss the possibility that the signal is caused by the second-order GWs associated with the formation of solar-mass primordial black holes (PBHs). This possibility can be tested by future interferometer-type GW observations targeting the stochastic GWs from merger events of solar-mass PBHs as well as by updates of PTA observations.
25 pages, 5 figures; reference added