A Note on the Generalized Friedmann Equations for a Thick Brane

Details A Note on the Generalized Friedmann Equations for a Thick Brane A Note on the Generalized Friedmann Equations for a Thick Brane

2008-03-15

arxiv.org/abs/0803.2288v1

Gen.Rel.Grav.40:1791-1796,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages,To appear in GRG

Scientific paper

10.1007/s10714-007-0578-0

Within our thick brane approach previously used to obtain the cosmological evolution equations on a thick brane embedded in a five-dimensional Schwarzschild Anti-de Sitter spacetime it is explicitly shown that the consistency of these equations with the energy conservation equation requires that, in general, the thickness of the brane evolves in time. This varying brane thickness entails the possibility that both Newton's gravitational constant $G$ and the effective cosmological constant $\Lambda_4$ are time dependent.

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