Degravitation Features in the Cascading Gravity Model

Details Degravitation Features in the Cascading Gravity Model Degravitation Features in the Cascading Gravity Model

2011-12-05

arxiv.org/abs/1112.1089v1

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

We obtain the effective gravitational equations on the codimension-2 and codimension-1 branes in the cascading gravity model. We then apply our formulation to the cosmological case and obtain the effective Friedmann equations on the codimension-2 brane, which are generically given in terms of integro-differential equations. Adopting an approximation for which the thickness of the codimension-2 brane is much smaller than the Hubble horizon, we study the Minkowski and de Sitter codimension-2 brane solutions. Studying the cosmological solutions shows that the cascading model exhibits the features necessary for degravitation of the cosmological constant.

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