Constraints on Dissipative Non-Equilibrium Dark Energy Models from Recent Supernova Data

TL;DR

This paper evaluates non-critical string cosmology models with rolling dilaton fields against recent supernova data, comparing their fit quality to standard dark energy models and those with super-horizon perturbations.

Contribution

It provides the first detailed comparison of non-critical string cosmology models with recent supernova observations, assessing their viability as dark energy alternatives.

Findings

Non-critical string models can fit supernova data comparably to standard models.

Rolling dilaton fields lead to relaxing dark energy contributions at late times.

Comparison shows potential viability of non-critical models as dark energy explanations.

Abstract

Non-critical string cosmologies may be viewed as the analogue of off-equilibrium models arising within string theory as a result of a cosmically catastrophic event in the early Universe. Such models entail relaxing-to-zero dark energies provided by a rolling dilaton field at late times. We discuss fits of such non-critical models to high-redshift supernovae data, including the recent ones by HST and ESSENCE and compare the results with those of a conventional model with Cold Dark Matter and a cosmological constant and a model invoking super-horizon perturbations.