BPS pp-wave brane cosmological solutions in string theory
Makoto Tanabe, Shuntaro Mizuno
TL;DR
This paper constructs time-dependent BPS pp-wave brane solutions in string theory, demonstrating their supersymmetry, application to inflationary cosmology, and mechanisms for ending inflation to recover the hot big-bang universe.
Contribution
It introduces new time-dependent BPS pp-wave brane solutions in M-theory and supergravity with applications to cosmological inflation.
Findings
Solutions satisfy crossing rule similar to S-branes
Solutions preserve 1/8 supersymmetry
Inflationary expansion with shrinking extra dimensions
Abstract
We construct time dependent BPS pp-wave brane solutions in the context of M-theory and type II supergravity. It is found that N-brane solutions we considered satisfy the crossing rule as S-brane solutions but 1/8 supersymmetry remains. By applying them to the cosmological setting, inflationary solutions are obtained. During this inflation, the size of the extradimensions becomes smaller than our four-dimensional spacetime dynamically. We also discuss the mechanism for terminating this inflation and recovering the hot big-bang universe.
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