M/String Theory, S-branes and Accelerating Universe

Details M/String Theory, S-branes and Accelerating Universe M/String Theory, S-branes and Accelerating Universe

2003-04-28

arxiv.org/abs/hep-th/0304225v2

JCAP 0307:001,2003

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, 5 figs, significant modifications are made

Scientific paper

10.1088/1475-7516/2003/07/001

Recently it was observed that the hyperbolic compactification of M/string theory related to S-branes may lead to a transient period of acceleration of the universe. We study time evolution of the corresponding effective 4d cosmological model supplemented by cold dark matter and show that it is marginally possible to describe observational data for the late-time cosmic acceleration in this model. However, investigation of the compactification 11d -> 4d suggests that the Compton wavelengths of the KK modes in this model are of the same order as the size of the observable part of the universe. Assuming that this problem, as well as several other problems of this scenario, can be resolved, we propose a possible solution of the cosmological coincidence problem due to relation between the dark energy density and the effective dimensionality of the universe.

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