Quantum Corrections for a Cosmological String Solution

TL;DR

This paper studies quantum effects on a cosmological string solution, showing that quantum corrections can remove classical singularities and generate a potential for scalar fields.

Contribution

It introduces a method to quantize scalar fields near singularities in string cosmology, revealing non-perturbative quantum corrections that alter the classical solution.

Findings

Singularities in scalar fields are resolved by quantum corrections.

Quantum effects generate a potential for scalar fields.

Classical solutions are modified by non-perturbative quantum effects.

Abstract

We investigate quantum corrections for a cosmological solution of the string effective action. Starting point is a classical solution containing an antisymmetric tensor field, a dilaton and a modulus field which has singularities in the scalar fields. As a first step we quantize the scalar fields near the singularity with the result that the singularities disappear and that in general non-perturbative quantum corrections form a potential in the scalar fields.