Spontaneous symmetry breaking in the present and early universe

Details Spontaneous symmetry breaking in the present and early universe Spontaneous symmetry breaking in the present and early universe

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988nuphb.301..685l&link_type=abstract

Nuclear Physics B, Volume 301, Issue 4, p. 685-705.

Physics

Nuclear Physics

8

Scientific paper

Spontaneous symmetry breaking in λφ4 theory is formulated in terms of the operator φ2, and in a manner which requires no specific expectation value to be assigned to φ. At the one-loop order of perturbation theory, a renormalized effective action for a field ζ, linearly related to φ2, is obtained as a gradient expansion. Potential advantages of this formulation in applications to phase transitions in the early universe are discussed. They include the possibilities (i) of obtaining a well-defined semiclassical equation of motion, and (ii) of following the evolution of a field theory from an initial symmetrical high temperature state without the introduction, ad hoc, of regions in which <φ> ≠ 0.
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