Double field inflation of generalized dilaton-axion models with a new Fayet-Iliopoulos (FI) term

TL;DR

This paper investigates the inflationary behavior of generalized dilaton-axion models incorporating a novel FI term, analyzing parameter relationships, initial conditions, SUSY breaking scales, and isocurvature effects.

Contribution

It introduces a new FI term into dilaton-axion inflation models and explores the resulting relationships between superpotential parameters and field dynamics.

Findings

Derived relationships between superpotential parameters and dilaton-axion fields.

Evaluated feasible initial field values and SUSY breaking scales.

Analyzed isocurvature perturbations in the model.

Abstract

We study the inflation dynamics of generalized dilaton-axion models with a new Fayet-Iliopoulos (FI) term. In particular, we find the relationships between the super-potential parameters and the coefficient of natural logarithm of the real part of dilaton-axion fields stored in the K\"ahler potential based on the vacuum conditions at the end of inflation. We also evaluate the feasible initial field values, their corresponding SUSY breaking scales and the iso-curvature parameters.