Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jkps...32..861l&link_type=abstract
Journal of the Korean Physical Society, Vol. 32, No. 6, p. 861 - 867
Physics
Universe: Phase Transitions, Universe: Baryons
Scientific paper
The universe is believed to have experienced a number of phase transitions in the early stage of its evolution. Those phase transitions may have played important roles in shaping the present state of the universe. Particularly, the electroweak phase transition is attracting much interest because of the possibility that it generated the baryon number asymmetry which we observe today. The effectiveness of the baryon number generation crucially depends on the velocity of the expanding electroweak bubble wall. The scale and the magnitude of the inhomogeneities of the baryon number density produced during the transition also depend on the bubble wall velocity. It is, therefore, important to be able to determine the bubble wall velocity exactly. The real-time formalism in finite-temperature field theory can be a suitable tool for investigating such a nonequilibrium process as the bubble expansion. In this work, starting with the effective action that is obtained by making use of the real-time formalism in finite-temperature field theory, the author examines how the dynamics of the bubble wall can be investigated.
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