Space-like branes, accelerating cosmologies and the near `horizon' limit

TL;DR

This paper explores how different classes of S-brane solutions in M/string theory can lead to accelerating cosmologies, with near-horizon limits resembling generalized Kasner metrics, enhancing understanding of holographic dualities.

Contribution

It demonstrates how accelerating cosmologies can originate from S-branes in a class previously not associated with such solutions, clarifying their near-horizon behavior.

Findings

Accelerating cosmologies arise from S-branes in the second class.

Near horizon limits of these S-branes are generalized Kasner metrics.

De Sitter structure is not obtained at lowest order supergravity.

Abstract

It is known that there exist two different classes of time dependent solutions in the form of space-like (or S)-branes in the low energy M/string theory. Accelerating cosmologies are known to arise from S-branes in one class, but not in the other where the time-like holography in the dS/CFT type correspondence may be more transparent. We show how the accelerating cosmologies arise from S-branes in the other class. Although we do not get the de Sitter structure in the lowest order supergravity, the near `horizon' ($t\to 0$) limits of these S-branes are the generalized Kasner metric.