Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-26
Phys.Rev. D67 (2003) 076005
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages 6 Postscript figures, uses RevTeX 4. Expanded discussion, published version
Scientific paper
10.1103/PhysRevD.67.076005
We study the dynamical generation of masses for fundamental fermions in quenched quantum electrodynamics (qQED) at finite temperature in the bare vertex approximation, using Schwinger-Dyson equations (SDE). Motivated by perturbation theory, a further simplification is introduced by taking the wave function renormalization to be unity. In the zeroth mode approximation, the SDE for the fermion propagator resembles QED in 2+1 dimensions (QED3) at zero temperature with an effective dimensionful coupling alpha'=alpha T. For a fixed temperature, mass is dynamically generated above a certain critical value of this coupling. As expected, raising the temperature restores chiral symmetry and fermions become massless again. We also argue that by summing over the frequency modes and under suitable simplifications, qualitative aspects of the result do not undergo significant changes.
Ayala Alejandro
Bashir Adnan
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