Baryon washout, electroweak phase transition, and perturbation theory

被引：0
作者：
Hiren H. Patel
Michael J. Ramsey-Musolf
机构：
[1] University of Wisconsin-Madison,Department of Physics
[2] California Institute of Technology,Kellogg Radiation Laboratory
来源：
Journal of High Energy Physics | / 2011卷
关键词：
Gauge Symmetry; Thermal Field Theory; BRST Symmetry;
D O I：
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摘要：
We analyze the conventional perturbative treatment of sphaleron-induced baryon number washout relevant for electroweak baryogenesis and show that it is not gauge-independent due to the failure of consistently implementing the Nielsen identities order-byorder in perturbation theory. We provide a gauge-independent criterion for baryon number preservation in place of the conventional (gauge-dependent) criterion needed for successful electroweak baryogenesis. We also review the arguments leading to the preservation criterion and analyze several sources of theoretical uncertainties in obtaining a numerical bound. In various beyond the standard model scenarios, a realistic perturbative treatment will likely require knowledge of the complete two-loop finite temperature effective potential and the one-loop sphaleron rate.
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