Generalised cosmology of codimension-two braneworlds

Abstract

It has recently been argued that codimension-two braneworlds offer a promising line of attack on the cosmological constant problem, since in such models the Hubble rate is not directly related to the brane tension. We point out challenges to building more general models where the brane content is not restricted to pure tension. In order to address these challenges, we construct a thick brane model which we linearize around a well known static solution. We show that the model's cosmology does reduce to standard FRW behaviour, but find no hint of a self-tuning mechanism which might help solve the cosmological constant problem whithin the context of non-supersymmetric Einstein gravity.

8 pages, talk given at MRST 2004: From Quarks to Cosmology, Concordia University, Montreal, May 2004

Cited by in corpus (7)

• On braneworld cosmologies from six dimensions, and absence thereof
• The Effective Field Theory of Codimension-two Branes
• Gravitational Waves in a Codimension Two Braneworld
• Conservation equation on braneworlds in six dimensions
• Regularized braneworlds of arbitrary codimension
• Geodesics, the Equivalence Principle and Singularities in Higher-dimensional General Relativity and Braneworlds
• Evolution of Thick Walls in Curved Spacetimes