Strings, Fivebranes and an Expanding Universe
Ramzi R. Khuri, Andriy Pokotilov

TL;DR
This paper demonstrates that velocity-dependent forces between fundamental strings and fivebranes can lead to an accelerating universe, extending previous results to more complex brane backgrounds and suggesting a general mechanism for cosmic acceleration.
Contribution
It generalizes earlier findings by showing that accelerating universe solutions also occur in fivebrane backgrounds and potentially in broader p-brane models.
Findings
Accelerating universe solutions are valid in fivebrane backgrounds.
Velocity-dependent forces induce cosmic acceleration.
The mechanism likely applies to general p-brane models.
Abstract
It was recently shown that velocity-dependent forces between parallel fundamental strings moving apart in a dimensional spacetime implied an accelerating expanding universe in -dimensional space-time. Exact solutions were obtained for the early time expansion in . Here we show that this result also holds for fundamental strings in the background of a fivebrane, and argue that the feature of an accelerating universe would hold for more general -brane-seeded models.
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