Liouville Cosmology

TL;DR

This paper explores Liouville string theory as a framework for understanding the Universe's non-equilibrium evolution, linking cosmic acceleration to string coupling and the dilaton's role.

Contribution

It proposes a unified approach to inflation and current acceleration using Liouville string theory, emphasizing the dilaton's influence on cosmic dynamics.

Findings

Links current acceleration to string coupling value

Identifies the dilaton as a driver of late-time acceleration

Provides a consistent non-critical string cosmology framework

Abstract

Liouville string theory is a natural framework for discussing the non-equilibrium evolution of the Universe. It enables non-critical strings to be treated in mathematically consistent manner, in which target time is identified with a world-sheet renormalization-group scale parameter, preserving target-space general coordinate invariance and the existence of an S-matrix. We review our proposals for a unified treatment of inflation and the current acceleration of the Universe. We link the current acceleration of the Universe with the value of the string coupling. In such a scenario, the dilaton plays an essential background role, driving the acceleration of the Universe during the present era after decoupling as a constant during inflation.