Friedmann branes with variable tension

Abstract

We introduce brane-worlds with non-constant tension, strenghtening the analogy with fluid membranes, which exhibit a temperature-dependence according to the empirical law established by Eötvös. This new degree of freedom allows for evolving gravitational and cosmological constants, the latter being a natural candidate for dark energy. We establish the covariant dynamics on a brane with variable tension in full generality, by considering asymmetrically embedded branes and allowing for non-standard model fields in the 5-dimensional space-time. Then we apply the formalism for a perfect fluid on a Friedmann brane, which is embedded in a 5-dimensional charged Vaidya-Anti de Sitter space-time.

12 pages, to appear in Phys. Rev. D

References in corpus (7)

• The virial theorem and the dynamics of clusters of galaxies in the brane world models
• Galactic dark matter as a bulk effect on the brane
• Solar system tests of brane world models
• Do Newton's G and Milgrom's a_0 vary with cosmological epoch ?
• Brane cosmology, Weyl fluid, and density perturbations
• On the validity of the 5-dimensional Birkhoff theorem: The tale of an exceptional case
• Living on a dS brane: Effects of KK modes on inflation