String Theory and Cosmology

TL;DR

This paper explores how string-loop effects and dilaton potentials influence cosmological phenomena like inflation, entropy, and the cosmological constant within an effective string theory framework.

Contribution

It introduces a model incorporating string-loop effects and dilaton potentials to analyze key cosmological issues in a homogeneous and isotropic setting.

Findings

String-loop effects impact inflationary dynamics.

Dilaton potential influences entropy and cosmological constant problems.

Framework addresses multiple cosmological issues simultaneously.

Abstract

We discuss the main cosmological implications of considering string-loop effects and a potential for the dilaton in the lowest order string effective action. Our framework is based on the effective model arising from regarding homogeneous and isotropic dilaton, metric and Yang-Mills field configurations. The issues of inflation, entropy crisis and the Polonyi problem as well as the problem of the cosmological constant are discussed.