Warped Deformed Throats have Faster (Electroweak) Phase Transitions
ArXiv 0708.2060 (2007)
Authors:
Babiker Hassanain, John March-Russell, Martin Schvellinger
Abstract:
We study the dynamics of the finite-temperature phase transition for warped
Randall-Sundrum(RS)-like throat models related to the Klebanov-Tseytlin
solution. We find that, for infrared branes stabilized near the tip of the
throat, the bounce action has a mild N^2 dependence, where N(y) \sim [M_5
L(y)]^{3/2} is the effective number of degrees of freedom of the holographic
dual QFT, and where L(y) is the local curvature radius, which decreases in the
infrared. In addition, the bounce action is not enhanced by large numbers.
These features allow the transition to successfully complete over a wider
parameter range than for Goldberger-Wise stabilized RS models. Due to the
increase of L(y) in the ultraviolet, the throat has a reliable gravitational
description even when the number of infrared degrees of freedom is small. We
also comment on aspects of the thermal phase transition in Higgsless models,
where the gauge symmetry breaking is achieved via boundary conditions. Such
models include orbifold-GUT models and the Higgsless electroweak symmetry
breaking theories of Csaki et al., with Standard Model gauge fields living in
the bulk.
