Dumping inflaton energy density out of this world

TL;DR

This paper proposes a brane world model with an infinite warped extra dimension where inflaton energy decays into the bulk, potentially explaining the disappearance of dark energy and the origin of matter and perturbations from MSSM flat directions.

Contribution

It introduces a novel mechanism for inflaton decay into the bulk in a warped brane world, impacting dark energy and matter origins.

Findings

Inflaton energy can decay into the bulk, removing dark energy from our brane.

Matter and CMB perturbations may originate from MSSM flat directions instead of inflaton.

Reheating effects on the observable brane could be negligible in certain string models.

Abstract

We argue that a brane world with a warped, infinite extra dimension allows for the inflaton to decay into the bulk so that after inflation, the effective dark energy disappears from our brane. This is achieved by the redshifting of the decay products into infinity of the 5th dimension. As a consequence, all matter and CMB density perturbations could have their origin in the decay of a MSSM flat direction rather than the inflaton. We also discuss a string theoretical model where reheating after inflation may not affect the observable brane.