Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-12-08
Phys.Rev.D61:106004,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, Latex file, no figures, comments added, references updated, final version to appear in Physical Review D
Scientific paper
10.1103/PhysRevD.61.106004
We consider 5-dimensional cosmological solutions of a single brane. The correct cosmology on the brane, i.e., governed by the standard 4-dimensional Friedmann equation, and stable compactification of the extra dimension is guaranteed by the existence of a non-vanishing \hat{T}^5_5 which is proportional to the 4-dimensional trace of the energy-momentum tensor. We show that this component of the energy-momentum tensor arises from the backreaction of the dilaton coupling to the brane. The same positive features are exhibited in solutions found in the presence of non-vanishing cosmological constants both on the brane (\Lambda_{br}) and in the bulk (\Lambda_B). Moreover, the restoration of the Friedmann equation, with the correct sign, takes place for both signs of $\Lambda_B$ so long as the sign of $\Lambda_{br}$ is opposite $\Lambda_B$ in order to cancel the energy densities of the two cosmological constants. We further extend our single-brane thin-wall solution to allow a brane with finite thickness.
Kanti Panagiota
Kogan Ian I.
Olive Keith A.
Pospelov Maxim
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