Accelerating massive galaxy formation with primordial black hole seed nuclei

TL;DR

This paper explores how primordial black holes as dark matter seeds can significantly accelerate galaxy formation, potentially explaining rapid galaxy assembly and the existence of diffuse galaxies.

Contribution

It introduces the concept that primordial black holes can serve as high-density seeds, drastically reducing galaxy formation timescales and providing a new mechanism for galaxy evolution.

Findings

PBHs can catalyze galaxy formation within 100 Myr

Massive PBHs as seeds lead to rapid halo assembly

Diffuse galaxies may originate from smaller PBH seeds

Abstract

If massive primordial black holes (PBHs) exist and constitute a fraction of the dark matter, they can dramatically catalyze galaxy formation. By acting as pre-existing, high-density seeds, they can shorten the galaxy assembly time to as little as 100 Myr for up to 10^8 solar mass PBH seeds, allowing for the rapid formation of host halos. Furthermore, low surface brightness or diffuse galaxies may represent a natural outcome of this process, perhaps as the residue of halos seeded by smaller PBHs that failed to accrete a major baryonic component.