QCD Viscosity to Entropy Density Ratio in the Hadronic Phase

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dc.creatorChen, Jiunn-Wei
dc.creatorLi, Yen-Han
dc.creatorLiu, Yen-Fu
dc.creatorNakano, Eiji
dc.date2007-03-21
dc.date2007-04-20
dc.date.accessioned2026-07-07T11:02:54Z
dc.date.available2026-07-07T11:02:54Z
dc.descriptionShear viscosity (eta) of QCD in the hadronic phase is computed by the coupled Boltzmann equations of pions and nucleons in low temperatures and low baryon number densities. The eta to entropy density ratio eta/s maps out the nuclear gas-liquid phase transition by forming a valley tracing the phase transition line in the temperature-chemical potential plane. When the phase transition turns into a crossover, the eta/s valley gradually disappears. We suspect the general feature for a first-order phase transition is that eta/s has a discontinuity in the bottom of the eta/s valley. The discontinuity coincides with the phase transition line and ends at the critical point. Beyond the critical point, a smooth eta/s valley is seen. However, the valley could disappear further away from the critical point. The eta/s measurements might provide an alternative to identify the critical points.
dc.description16 pages, 4 figures. Minor typos corrected and references added
dc.identifierhttps://arxiv.org/abs/hep-ph/0703230
dc.identifierhttp://arxiv.org/abs/hep-ph/0703230
dc.identifierPhys.Rev.D76:114011,2007
dc.identifierdoi:10.1103/PhysRevD.76.114011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188411
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleQCD Viscosity to Entropy Density Ratio in the Hadronic Phase
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