Solar-mass primordial black holes explain NANOGrav hint of gravitational waves
Kazunori Kohri, Takahiro Terada
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.
Topics & Concepts
PhysicsGravitational wavePrimordial black holeGravitational wave backgroundAstrophysicsPulsarSolar massIsotropyAstronomyInterferometrySolar SystemBinary black holeOpticsStarsPulsars and Gravitational Waves ResearchCosmology and Gravitation TheoriesGeophysics and Gravity Measurements