We present a model with an infinite volume bulk in which a braneworld with a cosmological constant evolves to a static, four-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 five-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 four-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.
|Original language||English (US)|
|Number of pages||9|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Nov 15 2001|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)