Warm Warped Throats

TL;DR

This paper explores warm brane inflation in warped throat geometries, proposing models with radial and angular inflatons stabilized by D7-branes, which better fit observational data through dissipation effects.

Contribution

It introduces two novel warm inflation models with radial and angular brane dynamics, enhancing compatibility with observations compared to cold inflation.

Findings

Dissipation effects improve observational fit of the models.

Radial and angular brane fields act as independent inflatons.

Models satisfy constraints more naturally than cold inflation.

Abstract

We investigate brane inflation, focusing on warm inflation realizations within a warped throat geometry. While the standard scenario relies on a single mobile $D3$-brane moving radially toward an anti-$D3$-brane at the tip of the throat, we propose two distinct inflationary pictures. In our approach, the radial and angular coordinates of a $D3$-brane on a warped deformed conifold act as two independent inflaton fields. We address moduli stabilization by incorporating a supersymmetrically embedded $D7$-brane, which generates the necessary radial and angular scalar potentials. Evaluating these radial and angular brane inflation setups within the warm inflation paradigm, we demonstrate that dissipation effects allow the models to satisfy recent observational constraints more naturally than their cold inflation counterparts for a given parameter space.