Four-Point Spectral Functions and Ward Identities in Hot QED
High Energy Physics - Phenomenology
2014-11-17 v2 High Energy Physics - Theory
Abstract
We derive spectral representations for the different components of the 4-point function at finite temperature in the real time formalism in terms of five real spectral densities. We explicitly calculate all these functions in QED in the hard thermal loop approximation. The Ward identities obeyed by the 1-loop 3- and 4-point functions in real time and their spectral functions are derived. We compare our results with those derived previously in the imaginary-time formalism for retarded functions in hot QCD, and we discuss the generalization of our results to non-equilibrium situations.
Keywords
Cite
@article{arxiv.hep-ph/9911494,
title = {Four-Point Spectral Functions and Ward Identities in Hot QED},
author = {Hou Defu and M. E. Carrington and R. Kobes and U. Heinz},
journal= {arXiv preprint arXiv:hep-ph/9911494},
year = {2014}
}
Comments
16 pages in Revtex with 3 figures, dense version, a typo corrected