Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-04-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
Based on talk given at the 4th Hellenic School on Elementary Particle Physics (Corfu, Greece, Sept. 1992), 12 pages, LATEX, IE
Scientific paper
We describe in detail, in the context of the simple scalar $\phi^4$ theory, the prescription for resummation of daisy and superdaisy diagrams in the effective potential using the solution of the gap equations in the infrared limit. We find that the latter procedure is consistent provided we neglect logarithmic terms from the finite-temperature self energies and from the integration of overlapping momenta. This amounts to dressing only the zero-mode contribution to the finite-temperature effective potential. Improving also the non-zero modes, would require exactly solving (not in the IR limit) the gap equations. In general this can only be done in a theory where all self-energies are momentum independent ({\em e.g.} in the scalar theory at the symmetric phase $\phi=0$). However some partial dressing procedures are still possible in general.
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