Branon stabilization from fermion-induced radiative corrections

Details Branon stabilization from fermion-induced radiative corrections Branon stabilization from fermion-induced radiative corrections

2008-12-08

arxiv.org/abs/0812.1307v3

Phys.Lett.B676:184-187,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages

Scientific paper

10.1016/j.physletb.2009.05.003

We consider a 3-brane embedded in 5-dimensional space time characterized by a Gaussian warp factor, for which the four-dimensional effective theory for brane fluctuation (branons) is unstable. We show that radiative corrections arising from fermions living on the brane, and therefore coupled to branons, stabilize the system by generating dynamically a spontaneous symmetry breaking for the branon field. The price to pay, for the corresponding mechanism to be consistent, is to have a large number of fermion flavours, and we discuss the fat brane scenario as an interpretation for the dressed branon theory, taking into account the Maxwell construction, which avoids the spinodal instability present in the perturbative effective potential.

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