Mirage Cosmology
arXiv:hep-th/9910174 · doi:10.1088/1126-6708/1999/11/022
Abstract
A brane universe moving in a curved higher dimensional bulk space is considered. The motion induces a cosmological evolution on the universe brane that is indistiguishable from a similar one induced by matter density on the brane. The phenomenological implications of such an idea are discussed. Various mirage energy densities are found, corresponding to dilute matter driving the cosmological expansion, many having superluminal properties or violating the positive energy condition. It is shown that energy density due to the world-volume fields is nicely incorporated into the picture. It is also pointed out that the initial singularity problem is naturally resolved in this context.
JHEP LateX, 20 pages, no figures;v2 references added and a few minor changes; (v3) Corrected an inconsequential error in eq. 6.2, 6.3. We thank D. Kutasov for bringing this to our attention (v4) Corrected inconsequential errors in (4.4)-(4.7) and (5.11). We thank A. Psinas for bringing them to our attention
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