Braneworld Flattening by a Cosmological Constant

Details Braneworld Flattening by a Cosmological Constant Braneworld Flattening by a Cosmological Constant

2001-04-24

arxiv.org/abs/hep-th/0104201v1

Phys.Rev.D64:104002,2001

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 3 figures RevTeX

Scientific paper

10.1103/PhysRevD.64.104002

We present a model with an infinite volume bulk in which a braneworld with a cosmological constant evolves to a static, 4-dimensional Minkowski spacetime. This evolution occurs for a generic class of initial conditions with positive energy densities. The metric everywhere outside the brane is that of a 5-dimensional Minkowski spacetime, where the effect of the brane is the creation of a frame with a varying speed of light. This fact is encoded in the structure of the 4-dimensional graviton propagator on the braneworld, which may lead to some interesting Lorentz symmetry violating effects. In our framework the cosmological constant problem takes a different meaning since the flatness of the Universe is guaranteed for an arbitrary negative cosmological constant. Instead constraints on the model come from different concerns which we discuss in detail.

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