Brane cosmological solutions in six-dimensional warped flux compactifications
Abstract
We study cosmology on a conical brane in the six-dimensional Einstein-Maxwell-dilaton system, where the extra dimensions are compactified by a magnetic flux. We systematically construct exact cosmological solutions using the fact that the system is equivalently described by (6+n)-dimensional pure Einstein-Maxwell theory via dimensional reduction. In particular, we find a power-law inflationary solution for a general dilatonic coupling. When the dilatonic coupling is given by that of Nishino-Sezgin chiral supergravity, this reduces to the known solution which is not inflating. The power-law solution is shown to be the late-time attractor. We also investigate cosmological tensor perturbations in this model using the (6+n)-dimensional description. We obtain the separable equation of motion and find that there always exist a zero mode, while tachyonic modes are absent in the spectrum. The mass spectrum of Kaluza-Klein modes is obtained numerically.
Cite
@article{arxiv.0705.3500,
title = {Brane cosmological solutions in six-dimensional warped flux compactifications},
author = {Tsutomu Kobayashi and Masato Minamitsuji},
journal= {arXiv preprint arXiv:0705.3500},
year = {2009}
}