Quasifermion spectrum at finite temperature from coupled Schwinger-Dyson equations for a fermion-boson system

Details Quasifermion spectrum at finite temperature from coupled Schwinger-Dyson equations for a fermion-boson system Quasifermion spectrum at finite temperature from coupled Schwinger-Dyson equations for a fermion-boson system

2008-03-22

arxiv.org/abs/0803.3257v2

Phys.Rev.D78:014004,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 10 figures, minor changes on discussion on renormalization, typos corrected, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.014004

We nonperturbatively investigate a fermion spectrum at finite temperature in a chiral invariant linear sigma model. Coupled Schwinger-Dyson equations for fermion and boson are developed in the real time formalism and solved numerically. From the coupling of a massless fermion with a massive boson, the fermion spectrum shows a three-peak structure at some temperatures even for the strong coupling region. This means that the three-peak structure which was originally found in the one-loop calculation is stable against higher order corrections even in the strong coupling region.

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