Friedmann Universes and Exact Solutions in String Cosmology

TL;DR

This paper demonstrates that classical null strings can produce the Einstein gravity solutions associated with D-dimensional Friedmann universes, linking string theory to cosmological models.

Contribution

It establishes a direct connection between null string solutions and classical cosmological metrics in higher dimensions.

Findings

Null strings generate Friedmann universe solutions.

Connection between string theory and cosmological models.

Extension to D-dimensional universes.

Abstract

We show that the classical null strings generate the Hilbert-Einstein gravity corresponding to D-dimensional Friedmann universes.