Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-05-24
JCAP 0707:016,2007
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, 2 figures; v2: references added; v3: version published in JCAP
Scientific paper
10.1088/1475-7516/2007/07/016
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.
Kobayashi Tsutomu
Minamitsuji Masato
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