Four--dimensional Gravity from Singular Spaces

Details Four--dimensional Gravity from Singular Spaces Four--dimensional Gravity from Singular Spaces

2002-02-20

arxiv.org/abs/hep-th/0202136v1

Phys.Rev. D65 (2002) 121501

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, LaTeX

Scientific paper

10.1103/PhysRevD.65.121501

The modification to four--dimensional Einstein gravity at low energy in two brane models is investigated within supergravity in singular spaces. Using perturbation theory around a static BPS background, we study the effective four--dimensional gravitational theory, a scalar--tensor theory, and derive the Brans--Dicke parameter when matter is present on the positive tension brane only. We show there is an attractor mechanism towards general relativity in the matter dominated era. The dynamics of the interbrane distance are discussed. Finally, when matter lives on both branes, we find that there is a violation of the equivalence principle whose magnitude is governed by the warping of the extra dimension.

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