Electrical conductivity of quark matter at finite T

Abstract

In this talk, I present the recent theoretical results on the electrical conductivity (EC) σ of quark matter, using the Kubo formula at finite temperature and zero quark density (T = 0, µ = 0) in the presence of an external strong magnetic field. The dilute instanton-liquid model with the caloron distribution is taken into account. It turns out that σ ≈ (0.02 ∼ 0.15) fm −1 for T = (0 ∼ 400) MeV with the relaxation time τ = (0.3 ∼ 0.9) fm. EC is parameterized as σ /T ≈ (0.46, 0.77, 1.08, 1.39)C EM for τ = (0.3, 0.5, 0.7, 0.9) fm, respectively. These results are well compatible with other theoretical estimations and show almost negligible effects from the magnetic field. The soft photon emission rate from the quark-gluon plasma is discussed as well.Xth Quark Confinement and the Hadron Spectrum,