Hard Thermal Loops , Quark - Gluon Plasma Response
نویسنده
چکیده
I outline various derivations of the non-Abelian Kubo equation, which governs the response of a quark-gluon plasma to hard thermal perturbations. In the static case, it is proven that gauge theories do not support hard thermal solitons. Explicit solutions are constructed within an SU (2) Ansatz and they are shown to support the general result. The time-dependent problem, i.e., non-Abelian plasma waves, has not been completely solved. We express and motivate the hope that the intimate relations linking the gauge-invariance condition for hard thermal loops to the equation of motion for T = 0, topo-logical Chern-Simons theory may yield new insight into this field. The study of the quark-gluon plasma (QGP) phase of high-temperature QCD 4 is relevant both to to big-bang cosmology and to heavy ions collisions. Experiments at CERN and Brookhaven have provided compelling evidence for the existence of an intermediate " phase " of QCD during such collisions, with an energy density ∼ 1 GeV /f m 3 (see for instance [1]). It is however not clear if this " phase " is a thermodynamically distinct one. A heavy-ions interaction, after the primary collision of ions bunches, forms a thermalized state which lasts for most of the total interaction time. It is in this thermalized state that the QGP " phase " is thought to be formed. The interaction ends by hadronization of the thermalized constituents. Each step of the process can be tested specifically [1, 2]. However, the methods
منابع مشابه
6 v 1 2 3 Ju l 1 99 3 CU - TP - 601 June 1993 Hard Thermal Loops , Gauged WZNW - Action and the Energy of Hot Quark - Gluon Plasma
The generating functional for hard thermal loops in Quantum Chromodynamics is rewritten in terms of a gauged Wess-Zumino-Novikov-Witten action by introducing an auxiliary field. This shows in a simple way that the contribution of hard thermal loops to the energy of the quark-gluon plasma is positive.
متن کاملar X iv : h ep - t h / 94 03 14 5 v 1 2 3 M ar 1 99 4 HARD THERMAL LOOPS , CHERN - SIMONS THEORY AND THE QUARK - GLUON PLASMA
The generating functional for hard thermal loops in Quantum Chromodynamics is important in setting up a resummed perturbation theory. I review how this functional is related to the eikonal for a Chern-Simons gauge theory, and using an auxiliary field, to the gauged Wess-Zumino-Novikov-Witten action. The induced current due to hard thermal loops, properly incorporating damping effects, is also b...
متن کاملHard Thermal Loops in a Moving Plasma and a Magnetic Mass Term
We consider the hard thermal loops of Quantum Chromodynamics for a moving quark-gluon plasma. Generalizing from this we suggest a candidate for the magnetic mass term. This mass term may also be useful in understanding the mass gap of three-dimensional non-Abelian gauge theories.
متن کاملHard Thermal Loops, Weak Gravitational Fields and The Quark Gluon Plasma Energy Momentum Tensor
We use an auxiliary field construction to discuss the hard thermal loop effective action associated with massless thermal SU(N) QCD interacting with a weak gravitational field. It is demonstrated that the previous attempt to derive this effective action has only been partially successful and that it is presently only known to first order in the graviton coupling constant. This is still sufficie...
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تاریخ انتشار 1996