LVK constraints on PBHs from stochastic gravitational wave background searches

TL;DR

This paper reviews how primordial black holes could produce a stochastic gravitational wave background detectable by current observatories, discussing methods, constraints, and implications of recent non-detections.

Contribution

It provides a comprehensive overview of the types of SGWB related to PBHs, detection techniques, and the latest constraints from LVK observations.

Findings

LVK observations impose constraints on PBH-related SGWB.

Non-detection of SGWB limits PBH abundance and formation scenarios.

Different sources of SGWB from PBHs are characterized and analyzed.

Abstract

Primordial black holes (PBHs) may have left an imprint in the form of a stochastic gravitational wave background (SGWB) throughout their evolution in the history of the Universe. This review highlights two types of SGWB: those generated by scalar curvature perturbations associated with PBH formation in the early Universe and those composed of ensembles of GWs emitted by PBH binaries. After describing detection methods and a brief introduction on Bayesian inference, we discuss current constraints imposed by LIGO-Virgo-KAGRA (LVK) observations through the non-detection of the SGWBs and discuss their physical implications.