Dual Space-Time and Nonsingular String Cosmology

TL;DR

This paper proposes a string cosmology model leveraging T-duality and double geometry to eliminate the big bang singularity, suggesting the universe's singularity is a coordinate artifact in Einstein gravity.

Contribution

It introduces a dual space-time framework based on Double Field Theory to resolve cosmological singularities in homogeneous and isotropic universes.

Findings

Singularities are replaced by dual descriptions where the universe expands infinitely.

T-duality symmetry leads to nonsingular cosmological solutions.

The big bang is interpreted as a dual universe expansion rather than a true singularity.

Abstract

Making use of the T-duality symmetry of superstring theory, and of the double geometry from Double Field Theory, we argue that cosmological singularities of a homogeneous and isotropic universe disappear. In fact, an apparent big bang singularity in Einstein gravity corresponds to a universe expanding to infinite size in the dual dimensions.