String--Kaluza--Klein Cosmology

TL;DR

This paper extends a five-dimensional string theory black hole solution to include arbitrary spatial curvature, then reduces it to a four-dimensional cosmological model with additional fields like the dilaton and torsion.

Contribution

It introduces a generalized five-dimensional solution with arbitrary curvature and derives a novel four-dimensional cosmological model from it.

Findings

The solution includes a dilaton, modulus field, and torsion.

The model describes an isotropic cosmological spacetime.

Features of the solution are analyzed in detail.

Abstract

We generalize a five dimensional black hole solution of low energy effective string theory to arbitrary constant spatial curvature. After interchanging the signature of time and radius we reduce the 5d solution to four dimensions and obtain that way a four dimensional isotropic cosmological space time. The solution contains a dilaton, modulus field and torsion. Several features of the solution are discussed.