A Cosmological Model of Holographic Brane Gravity

TL;DR

This paper presents a cosmological model involving two moving branes in a 5D bulk, analyzing their dynamics and late-time acceleration, with implications for understanding our universe's expansion.

Contribution

It introduces a holographic brane gravity model with two branes, incorporating a time-dependent cosmological constant and analyzing late-time deSitter solutions.

Findings

DeSitter solutions are obtained for late-time evolution.

The model predicts accelerative behavior at present time.

Radion dynamics encode brane separation information.

Abstract

A cosmological scenario with two branes (A and B) moving in a 5-dimensional bulk is considered. As in the case of ecpyrotic and born-again braneworld models it is possible that the branes collide. The energy-momentum tensor is taken to describe a perfect barotropic fluid on the A-brane and a phenomenological time-dependent "cosmological constant" on the B-brane. The A-brane is identified with our Universe and its cosmological evolution in the approximation of a homogeneous and isotropic brane is analysed. The dynamics of the radion (a scalar field on the brane) contains information about the proper distance between the branes. It is demonstrated that the deSitter type solutions are obtained for late time evolution of the braneworld and accelerative behaviour is anticipated at the present time.