What type of study is this?

This is a Quantitative Study study.

October 2, 2025Open Access

Primordial Gravitational Wave Background as a Probe of the Primordial Black Holes

Key Points

Our findings confirm that primordial gravitational waves can accurately explain the stochastic gravitational wave background detected by PTA, and they indicate potential signals for future observations.
The analysis highlights that forming primordial black holes from density perturbations remains within viable limits, ensuring no overproduction occurs in the mass range of $[10^{-12}-10^{-3}] M_{ ext{odot}}$.
By deriving the amplitudes of primordial gravitational waves, we establish existing constraints on the primordial black hole abundance across a comprehensive mass range.
The predicted stochastic gravitational wave background signals imply robust detection prospects by upcoming gravitational wave observatories.

Abstract

We study the formation of primordial black holes (PBHs) from the collapse of density perturbations induced by primordial gravitational waves (PGWs). The PGWs' interpretation of the stochastic gravitational wave background (SGWB) detected by the Pulsar Timing Array (PTA) corresponds to PBHs formation in the mass range 10^-12-10^-3 M_. Importantly, our analysis shows that PGWs' interpretation of recent PTA data remains viable, as it does not lead to PBH overproduction. We derive the amplitude of PGWs by leveraging existing constraints on the PBH abundance across a wide mass range. Notably, these constrained amplitudes predict SGWB signals that would be detectable by future gravitational wave observatories.

Read Full Paperexternally

Mark Helpful

Bookmark

Relay

View Full Paper