Domain Wall Dynamics in Brane World and Non-singular Cosmological Models

Details Domain Wall Dynamics in Brane World and Non-singular Cosmological Models Domain Wall Dynamics in Brane World and Non-singular Cosmological Models

2004-05-10

arxiv.org/abs/hep-th/0405077v2

Phys.Rev. D70 (2004) 064030

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, 11 figures, submitted to PRD. One reference is added. (v2)

Scientific paper

10.1103/PhysRevD.70.064030

We study brane cosmology as 4D (4-dimensional) domain wall dynamics in 5D bulk spacetime. For a generic 5D bulk with 3D maximal symmetry, we derive the equation of motion of a domain wall and find that it depends on mass function of the bulk spacetime and the energy-momentum conservation in a domain wall is affected by a lapse function in the bulk. Especially, for a bulk spacetime with non-trivial lapse function, energy of matter field on the domain wall goes out or comes in from the bulk spacetime. Applying our result to the case with SU(2) gauge bulk field, we obtain a singularity-free universe in brane world scenario, that is, not only a big bang initial singularity of the brane is avoided but also a singularity in a 5D bulk does not exist.

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