Non-Minimal Warm Inflation and Perturbations on the Warped DGP Brane with Modified Induced Gravity

TL;DR

This paper develops a warm inflation model on a warped DGP brane with non-minimal coupling and modified gravity, analyzing how these factors generate entropy perturbations even without radiation.

Contribution

It introduces a novel warm inflation framework with non-minimal coupling and $f(R)$-gravity modifications on a warped DGP brane, highlighting entropy perturbation generation.

Findings

Entropy perturbations are generated without radiation due to non-minimal coupling.

Modified induced gravity influences perturbation behavior.

The model extends warm inflation theory with new gravitational effects.

Abstract

We construct a warm inflation model with inflaton field non-minimally coupled to induced gravity on a warped DGP brane. We incorporate possible modification of the induced gravity on the brane in the spirit of $f(R)$-gravity. We study cosmological perturbations in this setup. In the case of two field inflation such as warm inflation, usually entropy perturbations are generated. While it is expected that in the case of one field inflation these perturbations to be removed, we show that even in the absence of the radiation field, entropy perturbations are generated in our setup due to non-minimal coupling and modification of the induced gravity.