Did NANOGrav see a signal from primordial black hole formation?

Abstract

We show that the recent NANOGrav result can be interpreted as a stochastic gravitational wave signal associated to formation of primordial black holes from high-amplitude curvature perturbations. The indicated amplitude and power of the gravitational wave spectrum agrees well with formation of primordial seeds for supermassive black holes.

7 pages, 4 figures. Minor corrections, results unchanged

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