Attractions to radiation-like eras in superstring cosmologies

TL;DR

This paper reviews how finite temperature and quantum effects in non-supersymmetric string models lead to radiation-like cosmological solutions, potentially explaining hierarchies and dimension changes in early universe scenarios.

Contribution

It demonstrates that string cosmology models naturally evolve towards radiation-like eras, revealing mechanisms for hierarchy generation and dynamical dimension change.

Findings

Evolution attracted to radiation-like solutions after Hagedorn era

Hierarchy between Planck mass and supersymmetry breaking scale

Possible dynamical change of space-time dimension

Abstract

We review the cosmology induced by finite temperature and quantum effects on non-supersymmetric string models. We show the evolution is attracted to radiation-like solutions after the Hagedorn era and before the electroweak phase transition. This mechanism generates a hierarchy between the Planck mass and the supersymmetry breaking scale. A dynamical change of space-time dimension can take place.