D-term Uplifted Racetrack Inflation

TL;DR

This paper demonstrates that racetrack inflation can be realized within a supergravity framework with a supersymmetric D-term uplift, maintaining key predictions like the spectral index while allowing for a simplified single-field model.

Contribution

It introduces a new racetrack inflation model with a D-term uplift, fully described by supergravity, and shows it preserves the original spectral index with a simplified single-field version.

Findings

Spectral index n_s = 0.95 consistent with original models

Gaugino condensates vary during inflation

Simplified single-field model is equivalent

Abstract

It is shown that racetrack inflation can be implemented in a moduli stabilisation scenario with a supersymmetric uplifting D-term. The resulting model is completely described by an effective supergravity theory, in contrast to the original racetrack models. We study the inflationary dynamics and show that the gaugino condensates vary during inflation. The resulting spectral index is n_s = 0.95 as in the original racetrack inflation model. Hence extra fields do not appear to alter the predictions of the model. An equivalent, simplified model with just a single field is presented.