Pre-big-bang black-hole remnants and the past low entropy

TL;DR

This paper explores how black-hole remnants from before the big bang in bouncing cosmology could explain dark matter and challenge traditional views on the universe's low entropy past, impacting the arrow of time.

Contribution

It proposes a novel scenario where pre-big-bang black-hole remnants account for dark matter and influence the understanding of entropy and the arrow of time.

Findings

Black-hole remnants could constitute dark matter.

Pre-big-bang remnants challenge the traditional low entropy explanation.

Implications for the arrow of time and cosmological models.

Abstract

Dark matter could be composed by black-hole remnants formed before the big-bang era in a bouncing cosmology. This hypothetical scenario has major implications on the issue of the arrow of time: it would upset a common attribution of past low entropy to the state of the geometry, and provide a concrete realisation to the perspectival interpretation of past low entropy.