Late-time Cosmic Dynamics from M-theory

TL;DR

This paper investigates the late-time acceleration behavior in M-theory cosmologies with hyperbolic and flux compactifications, revealing transient and late-time acceleration phases depending on cosmology type.

Contribution

It analyzes the late-time cosmic acceleration in M-theory compactifications, highlighting conditions for transient and sustained acceleration in different cosmological models.

Findings

Positive acceleration is transient in flat and closed cosmologies.

Open cosmologies can exhibit late-time positive acceleration.

Acceleration decays as a power law, with possible positive, negative, or oscillatory behavior.

Abstract

We consider the behaviour of the cosmological acceleration for time-dependent hyperbolic and flux compactifications of M-theory, with an exponential potential. For flat and closed cosmologies it is seen that a positive acceleration is always transient for both compactifications. For open cosmologies, both compactifications can give at late times periods of positive acceleration. As a function of proper time this acceleration has a power law decay and can be either positive, negative or oscillatory.