Generating $G_2$--cosmologies with perfect fluid in dilaton gravity

TL;DR

This paper introduces a method to generate exact inhomogeneous $G_2$-cosmological solutions in dilaton gravity with perfect fluid and specific potentials, expanding the set of known cosmological models.

Contribution

It develops a symmetry-based method for constructing new exact $G_2$-cosmologies in dilaton gravity with perfect fluids, including several novel classes of solutions.

Findings

New classes of explicit inhomogeneous perfect fluid scalar-tensor cosmologies

Method based on symmetry group of $G_2$-field equations

Enhanced solution set for dilaton gravity cosmologies

Abstract

We present a method for generating exact diagonal $G_2$-cosmological solutions in dilaton gravity coupled to a radiation perfect fluid and with a cosmological potential of a special type. The method is based on the symmetry group of the system of $G_2$-field equations. Several new classes of explicit exact inhomogeneous perfect fluid scalar-tensor cosmologies are presented.