Lower bound on the electroweak wall velocity from hydrodynamic instability
Abstract
The subsonic expansion of bubbles in a strongly first-order electroweak phase transition is a convenient scenario for electroweak baryogenesis. For most extensions of the Standard Model, stationary subsonic solutions (i.e., deflagrations) exist for the propagation of phase transition fronts. However, deflagrations are known to be hydrodynamically unstable for wall velocities below a certain critical value. We calculate this critical velocity for several extensions of the Standard Model and compare with an estimation of the wall velocity. In general, we find a region in parameter space which gives stable deflagrations as well as favorable conditions for electroweak baryogenesis.
Cite
@article{arxiv.1412.8064,
title = {Lower bound on the electroweak wall velocity from hydrodynamic instability},
author = {Ariel Megevand and Federico Agustin Membiela and Alejandro D. Sanchez},
journal= {arXiv preprint arXiv:1412.8064},
year = {2015}
}
Comments
30 pages, 7 figures. v2: Paper reorganized (some parts put in an appendix). Comments added. Results and conclusions unchanged. Version accepted in JCAP