Fermionic dispersion relations at finite temperature and non-vanishing chemical potentials in the minimal standard model

We calculate the fermionic dispersion relations in the minimal standard mod el at finite temperature in presence of non-vanishing chemical potentials d ue to the CP-asymmetric fermionic background. The dispersion relations are calculated for a vacuum expectation value of the Higgs field equal to zero (unbroken electroweak symmetry). The calculation: is performed in the real time formalism of the thermal field theory at one-loop order in a general x i gauge. The fermionic self-energy is calculated at leading order in temper ature and chemical potential and this fact permits us to obtain gauge-invar iant analytical expressions for the dispersion: relations. (C) 1999 Elsevie r Science B.V. All rights reserved.