6533b852fe1ef96bd12ab7c8
RESEARCH PRODUCT
Brane cosmology with an anisotropic bulk
David LangloisDavid LangloisDaniele A. SteerAlessandro FabbriAlessandro FabbriRobin Zegerssubject
High Energy Physics - TheoryNuclear and High Energy Physicsmedia_common.quotation_subjectFOS: Physical sciencesContext (language use)Perfect fluidGeneral Relativity and Quantum Cosmology (gr-qc)Cosmological constantAstrophysics01 natural sciencesGeneral Relativity and Quantum CosmologyTheoretical physicsGeneral Relativity and Quantum Cosmology0103 physical sciencesBrane cosmologyTensor010306 general physicsmedia_commonPhysicsSpacetimeExtra Large Dimensions010308 nuclear & particles physics[PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]Astrophysics (astro-ph)Cosmology of Theories beyond the SMUniverseHigh Energy Physics - Theory (hep-th)Branedescription
In the context of brane cosmology, a scenario where our universe is a 3+1-dimensional surface (the ``brane'') embedded in a five-dimensional spacetime (the ``bulk''), we study geometries for which the brane is anisotropic - more specifically Bianchi I - though still homogeneous. We first obtain explicit vacuum bulk solutions with anisotropic three-dimensional spatial slices. The bulk is assumed to be empty but endowed with a negative cosmological constant. We then embed Z_2-symmetric branes in the anisotropic spacetimes and discuss the constraints on the brane energy-momentum tensor due to the five-dimensional anisotropic geometry. We show that if the bulk is static, an anisotropic brane cannot support a perfect fluid. However, we find that for some of our bulk solutions it is possible to embed a brane with a perfect fluid though its energy density and pressure are completely determined by the bulk geometry.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-07-29 |