Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-09-22
Phys.Lett.B468:31-39,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex file, no figures, typos corrected, comments and references added, version to appear in Physics Letters B
Scientific paper
10.1016/S0370-2693(99)01218-6
We analyze cosmological equations in the brane world scenario with one extra space-like dimension. We demonstrate that the cosmological equations can be reduced to the usual 4D Friedmann type if the bulk energy-momentum tensor is different from zero. We then generalize these equations to the case of a brane of finite thickness. We also demonstrate that when the bulk energy-momentum tensor is different from zero, the extra space-like dimension can be compactified with a single brane and show that the stability of the radius of compactification implies standard cosmology and vice versa. For a brane of finite thickness, we provide a solution such that the 4D Planck scale is related to the fundamental scale by the thickness of the brane. In this case, compactification of the extra dimension is unnecessary.
Kanti Panagiota
Kogan Ian I.
Olive Keith A.
Pospelov Maxim
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