35 9 v 1 1 4 A ug 1 99 9 Dissipative phenomena in chemically non - equilibrated quark gluon plasma
نویسندگان
چکیده
The dissipative corrections to the hydrodynamic equations describing the evolution of energy-momentum tensor and parton densities are derived in a simple way using the scaling approximation for the expanding quark gluon plasma at finite baryon density. This procedure has been extended to study the process of chemical equilibration using a set of rate equations appropriate for a viscous quark gluon plasma. It is found that in the presence of dissi-pation, the temperature of the plasma evolves slower, whereas the quark and gluon fugacities evolve faster than their counterparts in the ideal case without viscosity.
منابع مشابه
Dissipative phenomena in chemically non-equilibrated quark gluon plasma
The dissipative corrections to the hydrodynamic equations describing the evolution of energy-momentum tensor and parton densities are derived in a simple way using the scaling approximation for the expanding quark gluon plasma at finite baryon density. This procedure has been extended to study the process of chemical equilibration using a set of rate equations appropriate for a viscous quark gl...
متن کامل- th / 9 30 70 07 v 1 7 J ul 1 99 3 CU - TP - 598 Color Diffusion and Conductivity in a Quark - Gluon Plasma
Color diffusion is shown to be an important dissipative property of quark-gluon plasmas that rapidly damps collective color modes. We derive the characteristic color relaxation time scale, tc ≈ (3αsT log(mE/mM ))−1, showing its sensitivity to the ratio of the static color electric and magnetic screening masses. This leads to a surprisingly small color conductivity, σc ≈ 2T/ log(mE/mM ), which i...
متن کامل- th / 9 90 50 16 v 1 6 M ay 1 99 9 Dilepton Production from ρ - Mesons in a Quark - Gluon Plasma ∗
Assuming that ρ -mesons exist in a quark-gluon plasma at temperatures close to the QCD phase transition, we calculate the dilepton production rate from q-q̄ annihilation via a ρ -meson state using Vector Meson Dominance. The result is compared to the rates from direct q-q̄ annihilation and from π-π annihilation. Furthermore we discuss the suppression of low mass dileptons if the quarks assume an ...
متن کاملar X iv : 0 80 7 . 20 92 v 2 [ he p - ph ] 1 4 A ug 2 00 9 Is QGP really a liquid ?
Here we address the question regarding the nature of quark gluon plasma (QGP), whether it is a liquid or strongly coupled plasma (SCP), using two different phenomenological models, namely quasi-particle model (qQGP) and strongly coupled quark gluon plasma (SCQGP). First we compare these two models, both of which explains the results of lattice simulation of quantum chromodynamics, as a function...
متن کاملar X iv : h ep - p h / 98 01 32 1 v 2 1 1 A ug 1 99 8 Dilepton emission from an equilibrating non - abelian plasma
We study dilepton production from a thermally equilibrating quark-gluon plasma expected to be formed in ultra relativistic heavy-ion collisions. The pre-equilibrium dynamics of quark-gluon plasma is studied within the color flux-tube model by solving non-abelian relativistic transport equations. This dilepton rate crucially depends on the collision time of the plasma. The results are compared w...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1999