Gravitation Wave signal from Asteroid mass Primordial Black Hole Dark Matter

TL;DR

This paper explores how primordial black holes in a specific mass range could account for all dark matter and produce detectable gravitational waves, linking early universe conditions to future observations.

Contribution

It presents a model-independent analysis connecting primordial black holes as dark matter candidates to observable gravitational wave signals in upcoming detectors.

Findings

PBHs could constitute the entire dark matter density.

Enhanced primordial curvature perturbations can produce detectable GWs.

Future GW detectors like eLISA, BBO, and DECIGO can observe these signals.

Abstract

Primordial Black Holes (PBHs) in the mass range $\sim 10^{17}- 10^{22}$g are currently unconstrained, and can constitute the full Dark Matter (DM) density of the universe. Motivated by this, in the current work, we aim to relate the existence of PBHs in the said mass range to the production of observable Gravitational Waves (GWs) in the upcoming GW detectors. We follow a relatively model-independent approach assuming that the PBHs took birth in a radiation dominated era from enhanced primordial curvature perturbation at small scales produced by inflation. We show that the constraints from CMB and BAO data allow for the possibility of PBHs being the whole of DM density of the universe. Finally, we derive the GW spectrum induced by the enhanced curvature perturbations and show that they are detectable in the future GW detectors like eLISA, BBO and DECIGO.