Massive scalar states localized on a de Sitter brane

Details Massive scalar states localized on a de Sitter brane Massive scalar states localized on a de Sitter brane

2003-02-11

arxiv.org/abs/hep-th/0302069v1

Phys.Rev.D68:064012,2003

Physics

High Energy Physics

High Energy Physics - Theory

14 pages; 5 figures

Scientific paper

10.1103/PhysRevD.68.064012

We consider a brane scenario with a massive scalar field in the five-dimensional bulk. We study the scalar states that are localized on the brane, which is assumed to be de Sitter. These localized scalar modes are massive in general, their effective four-dimensional mass depending on the mass of the five-dimensional scalar field, on the Hubble parameter in the brane and on the coupling between the brane tension and the bulk scalar field. We then introduce a purely four-dimensional approach based on an effective potential for the projection of the scalar field in the brane, and discuss its regime of validity. Finally, we explore the quasi-localized scalar states, which have a non-zero width that quantifies their probability of tunneling from the brane into the bulk.

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