Accelerating Cosmologies from S-Branes

TL;DR

It is pointed out that the recently proposed model of a flat four-dimensional universe with accelerated expansion in string or M theory is a special case of time-dependent solutions that the author found under the name of spacelike (S) branes.

Abstract

We point out that the recently proposed model of a flat 4-dimensional universe with accelerated expansion in string/M-theory is a special case of time-dependent solutions that the author found under the name of ``S-branes.'' We also show that similar accelerating models can be obtained from S-branes if the internal space is chosen to be hyperbolic or flat spaces.

Figures (4)

• Figure 1: The lhs of eq. (\ref{['cond12']}).
• Figure 2: The lhs of eq. (\ref{['cond22']}).
• Figure 3: The lhs of eq. (\ref{['cond13']}).
• Figure 4: The lhs of eq. (\ref{['cond23']}).