Recurrent Acceleration in Dilaton-Axion Cosmology

TL;DR

This paper identifies a class of Einstein-dilaton-axion cosmological models where most flat, expanding, homogeneous, and isotropic universes experience recurrent acceleration phases, extending understanding of eternal acceleration in open universes.

Contribution

It introduces new Einstein-dilaton-axion models demonstrating recurrent acceleration, expanding the theoretical framework of cosmological acceleration phenomena.

Findings

Most flat, expanding universes in the models undergo recurrent acceleration.

Extended results on eternally accelerating open universes.

Models provide new insights into cyclic or recurrent cosmic acceleration.

Abstract

A class of Einstein-dilaton-axion models is found for which almost all flat expanding homogeneous and isotropic universes undergo recurrent periods of acceleration. We also extend recent results on eternally accelerating open universes.