Warm tachyonic inflation in warped background

TL;DR

This paper investigates warm tachyonic inflation within warped backgrounds, demonstrating that consistency with observations requires warped compactification and significantly fewer background branes compared to cold inflation models.

Contribution

It provides a detailed analysis of warm tachyonic inflation in warped backgrounds, highlighting the necessity of warped compactification and a reduced number of background branes.

Findings

Warped compactification is essential for observational consistency.

Number of background branes is about 10, much fewer than in cold inflation.

Effective action validity depends on the warped background setup.

Abstract

We analyze warm tachyonic inflation, proposed in the literature, but from the viewpoint of four dimensional effective action for tachyon field on a non-BPS D3-brane. We find that consistency with observational data on density perturbation and validity of effective action requires warped compactification. The number of background branes which source the flux is found to be of the order of 10 in contrast to the order of $10^{14}$ in the standard cold inflationary scenario.