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The NANOGrav Collaboration has recently published strong evidence for a stochastic common-spectrum process that may be interpreted as a stochastic gravitational wave background. We show that such a signal can be explained by second-order gravitational waves produced during the formation of primordial black holes from the collapse of sizeable scalar perturbations generated during inflation. This possibility has two predictions: (i) the primordial black holes may comprise the totality of the dark matter with the dominant contribution to their mass function falling in the range (10^-15÷10^-11) M⊙ and (ii) the gravitational wave stochastic background will be seen as well by the Laser Interferometer Space Antenna experiment.
Luca et al. (Thu,) studied this question.
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