Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-04-09
Phys.Lett. B567 (2003) 322-329
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, latex, two figures, v4: minor clarifications and references added, version to appear in Physics Letters B,v5:some mi
Scientific paper
10.1016/j.physletb.2003.06.060
We point out that the solution of $(4+n)$-dimensional gravity coupled to the dilaton and an $n$-form field strength can give rise to a flat 4-dimensional universe (with a scale factor) of the type proposed recently under time dependent compactifications. The compact internal spaces could be hyperbolic, flat or spherical and the solution is identical to the space-like two brane or S2-brane. As has been shown previously for SM2 solution with a fixed field strength we show that for $n=7$ (where the dilaton is vanishing and with a general field strength), 6 the corresponding SM2 and SD2 solutions can give accelerating cosmologies in Einstein frame for both hyperbolic and flat internal spaces, thereby meeting the challenge of obtaining such a solution from M/String theory compactifications.
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