Cosmological evolution in a two-brane warped geometry model

TL;DR

This paper develops a 4D scalar-tensor inflationary model derived from a two-brane warped geometry, showing it aligns with recent cosmological observations and discusses modulus stabilization and implications for BICEP2 results.

Contribution

It introduces a natural inflaton potential from radion energy-momentum tensor within a brane-world scenario, linking higher-dimensional geometry to observable inflation.

Findings

Inflaton potential arises from radion dynamics.

Model consistent with Planck data.

Discusses implications for BICEP2 results.

Abstract

We study an effective 4-dimensional scalar-tensor field theory, originated from an underlying brane-bulk warped geometry, to explore the scenario of inflation. It is shown that the inflaton potential naturally emerges from the radion energy-momentum tensor which in turn results into an inflationary model of the Universe on the visible brane that is consistent with the recent results from the Planck's experiment. The dynamics of modulus stabilization from the inflaton rolling condition is demonstrated. The implications of our results in the context of recent BICEP2 results are also discussed.