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Gluon spectral functions and transport coefficients in Yang--Mills theory

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arxiv 1308.4960 v1 pith:AMMMQP7P submitted 2013-08-22 hep-ph hep-lathep-th

Michael Haas , Leonard Fister , Jan M. Pawlowski This is my paper
classification hep-phhep-lathep-th
keywords spectralgluonentropyfunctionfunctionsratiotemperatureclosed
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abstract

We compute non-perturbative gluon spectral functions at finite temperature in quenched QCD with the maximum entropy method. We also provide a closed loop equation for the spectral function of the energy-momentum tensor in terms of the gluon spectral function. This setup is then used for computing the shear viscosity over entropy ratio $\eta/s$ in a temperature range from about $0.4\, T_c$ to $4.5\, T_c$. The ratio $\eta /s$ has a minimum at about $1.25\, T_c$ with the value of about 0.115. We also discuss extensions of the present results to QCD.

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  1. What is the Quark-Gluon Plasma made of?

    nucl-th 2025-06 accept novelty 2.0 of 10

    The quark-gluon plasma is best described as a strongly coupled liquid of massive, very short-lived quark and gluon quasiparticles, with sound (phonon) modes becoming the most well-defined collective excitation at low momenta.

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