Inflation in Supersymmetric Cosmic String Theories

TL;DR

This paper explores how supersymmetric gauge theories naturally incorporate hybrid inflation and cosmic string formation, analyzing their implications for early universe cosmology and temperature anisotropies.

Contribution

It demonstrates that certain SUSY gauge theories inherently include hybrid inflation and cosmic string formation, providing a link between particle physics and cosmological observations.

Findings

Inflation occurs automatically in the studied SUSY theories.

Cosmic strings are formed at the end of inflation.

Temperature anisotropy scales as (M_GUT/M_P)^2.

Abstract

We examine a non-Abelian SUSY $SU(2) \times U(1)$ gauge theory and a SUSY U(1) theory originally used to investigate the microphysics of cosmic strings in supersymmetric theories. We show that both theories automatically include hybrid inflation. In the latter theory we use a $D$ term to break the symmetry. SUSY is broken during inflation and restored afterwards. Cosmic strings are formed at the end of inflation. The temperature anisotropy is calculated and found to vary as $(M_{GUT}/M_P)^2$.