D-term Inflation in Type I String Theory

TL;DR

This paper demonstrates that D-term inflation issues in heterotic string theory can be resolved by using type I string theory or orientifolds of type IIB strings, addressing scale and coupling constant problems.

Contribution

It introduces a solution to D-term inflation problems by applying type I string theory or orientifolds, improving the model's consistency with observational data.

Findings

Problems with scale and coupling in heterotic D-term inflation are resolved.

Type I string theory provides a viable framework for D-term inflation.

Enhanced compatibility with COBE data and supergravity constraints.

Abstract

D-term inflation realized in heterotic string theory has two problems: the scale of the anomalous D-term is too large for accounting for COBE data and the coupling constant of the anomalous U(1) is too large for supergravity to be valid. We show that both of these problems can be easily solved in D-term inflation based on type I string theory or orientifolds of type IIB strings.