Stringy black-hole gas in $\alpha'$-corrected dilaton gravity

TL;DR

This paper explores the properties and stability of a primordial stringy black-hole gas in early universe cosmology, using $ ext{α'}$-corrected string effective actions and phase space analysis.

Contribution

It provides explicit solutions for a string-hole gas in $ ext{α'}$-corrected dilaton gravity and analyzes their stability across different configurations.

Findings

Stringy black-hole gas can be described by explicit $ ext{α'}$-corrected solutions.

The stability of these solutions depends on the chosen string effective action.

$O(d,d)$-symmetric configurations are also considered in the stability analysis.

Abstract

We discuss the properties of the gas of primordial `stringy' black holes possibly formed in the high-curvature phase preceding the bouncing transition to the phase of standard cosmological evolution. We show that the regime dominated by such a string-hole gas can be consistently described by explicit solutions of the string effective action including first-order $\alpha'$ corrections. We present a phase space analysis of the stability of such solutions comparing the results obtained from different actions and including the possibility of $O(d,d)$-symmetric configurations.