Inhomogeneous Pre-Big Bang String Cosmology

TL;DR

This paper presents an inhomogeneous pre-Big Bang cosmological model derived from string theory, showing that generic initial conditions lead to a universe that naturally evolves towards homogeneity, flatness, and isotropy.

Contribution

It introduces an inhomogeneous version of pre-Big Bang cosmology within string theory, demonstrating natural emergence of large-scale uniformity from generic initial conditions.

Findings

Homogeneity, flatness, and isotropy emerge naturally as late-time outcomes.

The model is valid from generic initial conditions in the weak-coupling, low-curvature regime.

Inhomogeneous initial conditions evolve towards a homogeneous universe.

Abstract

An inhomogeneous version of pre--Big Bang cosmology emerges, within string theory, from quite generic initial conditions, provided they lie deeply inside the weak-coupling, low-curvature regime. Large-scale homogeneity, flatness, and isotropy appear naturally as late-time outcomes of such an evolution.