Challenges for Superstring Cosmology

TL;DR

This paper examines the compatibility of superstring theory with cosmological models, highlighting significant challenges posed by dilaton interactions that hinder inflation and the universe reaching a stable, zero cosmological constant state.

Contribution

It identifies fundamental issues in superstring cosmology related to dilaton interactions that impact inflation and the universe's long-term stability.

Findings

Dilaton interactions create obstacles for inflation.

Reaching a zero cosmological constant state is unlikely.

Superstring theory faces serious cosmological compatibility issues.

Abstract

We consider whether current notions about superstring theory below the Planck scale are compatible with cosmology. We find that the anticipated form for the dilaton interaction creates a serious roadblock for inflation and makes it unlikely that the universe ever reaches a state with zero cosmological constant and time-independent gravitational constant.