Cosmological Acceleration from Energy Influx

TL;DR

This paper explores how energy influx from the bulk can cause accelerated expansion in a brane universe, with effects varying across different cosmological eras, highlighting a novel mechanism for cosmic acceleration.

Contribution

It introduces a model where bulk energy influx induces acceleration on the brane, depending on matter equations of state, providing a new perspective on cosmic acceleration mechanisms.

Findings

Energy influx can cause accelerated expansion during matter domination.

Brane expansion remains decelerating during radiation era.

Absorption of bulk matter influences the acceleration parameter.

Abstract

We discuss the cosmological evolution of a 3-brane Universe in the presence of energy influx from the bulk. We show that this influx can lead to accelerated expansion on the brane, depending on the equations of state of the bulk and brane matter. The absorption of non-relativistic bulk matter by the brane at an increasing rate leads to a small positive acceleration parameter during the era of matter domination on the brane. On the other hand, the brane expansion remains decelerating during radiation domination.