On Ellipsoidal Collapse and Primordial Black-Hole Formation

TL;DR

This paper examines how non-spherical gravitational collapse influences the formation and abundance of primordial black holes, revealing that considering ellipsoidal shapes reduces their expected numbers and energy density.

Contribution

It provides a detailed analysis of ellipsoidal collapse effects on primordial black-hole formation, highlighting the importance of non-sphericity in such cosmological models.

Findings

Non-sphericity decreases primordial black-hole abundance.

Ellipsoidal collapse impacts energy density of black holes.

Reevaluation of primordial black-hole formation rates.

Abstract

We reinvestigate gravitational ellipsoidal collapse with special focus on its impact on primordial black-hole formation. For a generic model we demonstrate that the abundance and energy density of the produced primordial black holes will be significantly decreased when the non-sphericity of the overdensities is taken into account.