Baryon washout, electroweak phase transition, and perturbation theory



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.


Gauge Symmetry Thermal Field Theory BRST Symmetry 


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Copyright information

© SISSA, Trieste, Italy 2011

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of Wisconsin-MadisonMadisonU.S.A.
  2. 2.Kellogg Radiation LaboratoryCalifornia Institute of TechnologyPasadenaU.S.A.

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