Primordial black hole formation from cosmological fluctuations

TL;DR

This paper reviews recent analytical and numerical results on the formation threshold of primordial black holes, which are crucial for understanding their impact on early Universe evolution and constraining cosmological models.

Contribution

It provides a summary of new analytical and numerical findings on PBH formation thresholds based on cosmological long-wavelength solutions.

Findings

Determined the formation threshold for PBHs.

Analyzed the impact of cosmological fluctuations on PBH formation.

Provided insights into early Universe conditions affecting PBH abundance.

Abstract

Primordial black holes (PBHs) are those which may have formed in the early Universe and affected the subsequent evolution of the Universe through their Hawking radiation and gravitational field. To constrain the early Universe from the observational constraint on the abundance of PBHs, it is essential to determine the formation threshold for primordial cosmological fluctuations, which are naturally described by cosmological long-wavelength solutions. I will briefly review our recent analytical and numerical results on the PBH formation.