String Theory, Space-Time Non-Commutativity and Structure Formation

TL;DR

This paper explores how string theory's non-commutative space-time impacts structure formation in the universe, examining modifications to effective field theory during inflation and alternative scenarios like string gas cosmology.

Contribution

It introduces the implications of space-time non-commutativity for cosmological structure formation, including effects on inflation and string gas cosmology.

Findings

Non-commutative effects modify inflationary structure formation.

Minimal length may lead to alternative structure formation scenarios.

String gas cosmology offers a different mechanism from inflation.

Abstract

A natural consequence of string theory is a non-commutative structure of space-time on microscopic scales. The existence of a minimal length, and a modification of the effective field theory are two consequences of this space-time non-commutativity. I will first explore some consequences of the modifications of the effective field theory for structure formation in the context of an inflationary cosmology. Then, I will explore the possibility that the existence of a minimal length will lead to a structure formation scenario different from inflation. Specifically, I will discuss recent work on string gas cosmology.