Evolution of Bulk Scale Factor in Warped Space-time

TL;DR

This paper investigates how extra dimensions influence the accelerated expansion of the universe within a higher-dimensional FRW cosmology framework, emphasizing the significance of the bulk scale factor in warped 5D space-time.

Contribution

It introduces a modified 5D FRW model with warped space-time and analyzes the variation of the bulk scale factor with respect to space-like and time-like extra dimensions.

Findings

Both space-like and time-like extra dimensions are important.

The bulk scale factor has two distinct roles.

Extra dimensions impact the universe's acceleration.

Abstract

In this work the role of extra dimensions in the accelerated universe through the scenario of higher-dimensional Friedmann-Robertson-Walker (FRW) cosmology has been studied. For this purpose, we first consider warped space-time in the standard flat brane scenario as the modified form of Robertson-Walker (RW) metric in five-dimension (5D) space-time and then the variation of the bulk scale factor (warp factor), with respect to both space-like and time-like extra dimensions is obtained. Finally, it is shown that both of two types of extra dimensions are important in this scenario and also the bulk scale factor plays two different roles.