Thermal Relaxation Time in Chemically Non-equilibrated Quark- Gluon Plasma

Abstract

The definition of thermal relaxation time is extended to chemically non-equilibrated quark-gluon plasma and the chemical non-equilibrated thermal relaxation times for partons are calculated using the non-equilibrium Debye mass as the infrared regulator. The dependence of the thermal relaxation time on the fugacity is given and the influence of the chemical non-equilibration is discussed. We find that there are threshold fugacities ${\lambda }_g^{\ast }$ and ${\lambda }_q^{\ast }$ for gluons and quarks. For λ_g < λ_g^* (λ_q < λ_q^*), τ_g^{NEQ}/τ_g^{EQ} (τ_q^{NEQ}/τ_q^{EQ}) decreases strongly with increasing fugacity, while for ${\lambda }_g>{\lambda }_g^{\ast }({\lambda }_q>{\lambda }_q^{\ast }$), the ratios are almost 1. It is shown that there is also the two-stage equilibration in a chemically non-equilibrated plasma. We also discussed the effect of using the non-equilibrium Deby mass as the infrared cutoff.

11 pages, 4 figures, Revtex, submitted to Phys. Rev. C

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• Expansion, Thermalization and Entropy Production in High-Energy Nuclear Collisions
• Spectral functions for composite fields and viscosity in hot scalar field theory
• Non-Abelian Kubo Formula and the Multiple Time-Scale Method

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