# New Venues in Formation and Detection for Primordial Black Hole Dark Matter

## TL;DR

This paper introduces a new mechanism for primordial black hole formation from scalar field fragmentation, avoiding fine-tuning issues, and explores astrophysical signatures of small PBHs as dark matter candidates in the context of multi-messenger astronomy.

## Contribution

It proposes a novel PBH formation mechanism that bypasses inflaton potential fine-tuning and discusses new astrophysical signatures of small PBHs as dark matter.

## Key findings

- New PBH formation mechanism from scalar field fragmentation
- Potential astrophysical signatures from interactions with compact stars
- Small PBHs could constitute all dark matter in certain parameter spaces

## Abstract

Primordial black holes (PBHs) are not as exotic as once thought and constitute a compelling non-particle dark matter (DM) candidate. We present a novel general PBH formation mechanism from scalar field fragmentation, which does not suffer from the inflaton potential fine-tuning that plagues many of the standard PBH formation models. We discuss how interactions of compact stars with very small sub-lunar/asteroid-size PBHs, which reside in the open window of parameter space where PBHs can constitute all of DM, allow for a slew of new astrophysical signatures that could shed light on PBH DM and are particularly interesting in the era of multi-messenger astronomy.