eta/s is critical (at phase transitions)

Details eta/s is critical (at phase transitions) eta/s is critical (at phase transitions)

2008-12-11

arxiv.org/abs/0812.2203v1

AIP Conf.Proc.1116:421-423,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

3-pages, 2 figures, contribution to XIII Mexican School of Particles and Fields, to be published in AIP-proceedings

Scientific paper

10.1063/1.3131589

The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this quantity does have a minimum at a phase transition or crossover. Although indications from conventional non-relativistic gases point out to even a divergence in eta/s when the phase-transition is first-order, since the critical exponent is rather low, this will be more difficult to ascertain in RHIC or FAIR. The experimental data are more likely to reveal a discontinuity for a first order phase transition or a smooth minimum at a crossover.

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