Enhanced Detectability of Spinning Primordial Black Holes

TL;DR

This paper demonstrates that the rapid spin of primordial black holes formed during matter domination significantly enhances the gravitational-wave background detectability, increasing the amplitude by about 50%.

Contribution

It introduces a model showing how black hole spin boosts gravitational-wave signals, improving detection prospects.

Findings

50% increase in gravitational-wave amplitude due to black hole spin

Spinning primordial black holes produce a stronger stochastic background

Enhanced detectability of gravitational waves from black hole mergers

Abstract

Primordial black holes which are produced during an epoch of matter domination are expected to spin rapidly. It is shown that this leads to an enhancement of the detectability of the stochastic gravitational-wave background from their mergers. For a specific model, we explicitly demonstrate that this yields a $50\,\%$ increase of the gravitational-wave amplitude as compared to the non-spinning case.