Massive scalar states localized on a de Sitter brane

David Langlois (1) , Misao Sasaki

1 IAP - Institut d'Astrophysique de Paris

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 a de Sitter brane. 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 quasilocalized scalar states, which have a nonzero width that quantifies their probability of tunneling from the brane into the bulk.

Mots clés: 04.50.+h; 98.80.Cq; Gravity in more than four dimensions Kaluza-Klein theory unified field theories; alternative theories of gravity; Particle-theory and field-theory models of the early Universe; High Energy Physics - Theory; Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology

Domaines: Planète et Univers [physics]

David Langlois, Misao Sasaki. Massive scalar states localized on a de Sitter brane. Physical Review D, 2003, 68, 409, p.275-286. ⟨10.1103/PhysRevD.68.064012⟩. ⟨hal-04111193⟩