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Proceedings 2019, 10(1), 7; https://doi.org/10.3390/proceedings2019010007

Low-Shear QCD Plasma from Perturbation Theory

1
AEC, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
2
Department of Physics, University of Cape Town, Rondebosch 7700, South Africa
*
Author to whom correspondence should be addressed.
Presented at Hot Quarks 2018—Workshop for Young Scientists on the Physics of Ultrarelativisticr Nucleus-Nucleus Collisions, Texel, The Netherlands, 7–14 September 2018.
Published: 10 April 2019
PDF [349 KB, uploaded 10 April 2019]

Abstract

We argue that the inferred ratio of shear viscosity to entropy density of the quark-gluon
plasma, h/s < 0.5 near the deconfinement temperature Tc, can be understood from perturbative QCD.
To rebut opposite views, we first show that the existing leading order result should not be expanded
in logarithms. After then settling the question of scale for the running coupling, we establish a
temperature dependence of h/s which agrees well with constraints from hydrodynamics.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jackson, G.; Peshier, A. Low-Shear QCD Plasma from Perturbation Theory. Proceedings 2019, 10, 7.

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