Primordial black holes from D-parity breaking in SO(10) grand unified theory

TL;DR

This paper explores a novel mechanism for primordial black hole formation via collapsing domain walls originating from D-parity breaking in an SO(10) grand unified theory, linking GUT physics with observable black hole relics.

Contribution

It introduces a new formation process for PBHs involving pseudo-topological domain walls in a supersymmetric SO(10) GUT, connecting high-energy theory with astrophysical observations.

Findings

PBH abundance constraints can test SO(10) GUT models

Domain wall collapse can produce observable PBHs

Results refine understanding of PBH formation in GUT contexts

Abstract

The growing evidence of gravitational waves from binary black hole mergers has renewed the interest in study of primordial black holes (PBH). Here we study a mechanism for the formation of PBH from collapse of pseudo-topological domain walls which form out of equilibrium during inflation and then collapse post inflation. We apply the study to domain wall formation due to $D$-parity embedded in a supersymmetric grand unified theory (GUT) based on $SO(10)$ and compare the abundance of resulting PBH with the existing constraints. Thus the macroscopic relics can then be used to constrain or rule out a GUT, or demand a refinement of the theory of PBH formation in this class of GUTs.