2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196130We extend our previous analysis of gauge and Dirac fields in the presence of a chemical potential. We consider an alternate thermal operator which relates in a simple way the Feynman graphs in QED at finite temperature and charge density to those at zero temperature but non-zero chemical potential. Several interesting features of such a factorization are discussed in the context of the thermal photon and fermion self-energies.4 pagesHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext