Classical Field Dynamics of the Electroweak Phase Transition

Abstract

We investigate the thermodynamics and dynamics of the electroweak phase transition by modelling the infrared physics with classical Yang-Mills Higgs theory. We discuss the accuracy of this approach and conclude that, for quantities whose determination is dominated by the infrared, the classical method should be correct up to parametrically suppressed (ie O(alpha)) corrections. For a Higgs self-coupling which at tree level corresponds to m_H ~ 50 GeV, we determine the jump in the order parameter to be delta phi = 1.5 gT, the surface tension to be sigma = 0.07 g^4 T^3, and the friction coefficient on the moving bubble wall due to infrared bosons to be η= P/v_w = 0.03 \pm .004 g^6 T^4. We also investigate the response of Chern-Simons number to a spatially uniform chemical potential and find that it falls off a short distance inside the bubble wall, both in equilibrium and below the equilibrium temperature.

50 pages with figures (uses psfig). Revised to compress number of figures, fix some typographical errors, and revise the data for the case of a localized chemical potential on the bubble wall. This version has appeared in Phys. Rev. D55, 6538 (1997)

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• Thermalization algorithms for classical gauge theories

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