  Viscous modifications to the thermal distributions of quark-antiquarks and
gluons have been studied in a quasi-particle description of the
quark-gluon-plasma medium created in relativistic heavy-ion collision
experiments. The model is described in terms of quasi-partons that encode the
hot QCD medium effects in their respective effective fugacities. Both shear and
bulk viscosities have been taken in to account in the analysis and the
modifications to thermal distributions have been obtained by modifying the the
energy momentum tensor in view of the non-trivial dispersion relations for the
gluons and quarks. The interactions encoded in the equation of state induce
significant modifications to the thermal distributions. As an implication,
dilepton production rate in the $q\bar{q}$ annihilation process has been
investigated. The equation of state is found to have significant impact on the
dilepton production rate along with the viscosities.

Nuclear Theory