Eta/s and phase transitions



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Dobado González, Antonio and Llanes Estrada, Felipe José and Torres Rincón, Juan M. (2009) Eta/s and phase transitions. Physical Review D , 79 (1). ISSN 1550-7998

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We present a calculation of eta/s for the meson gas (zero baryon number), with the viscosity computed within unitarized next-to-leading-order chiral perturbation theory, and confirm the observation that eta/s decreases towards the possible phase transition to a quark-gluon plasma/liquid. The value is somewhat higher than previously estimated in leading-order chi PT. We also examine the case of atomic Argon gas to check the discontinuity of eta/s across a first-order phase transition. Our results suggest employing this dimensionless number, sometimes called KSS number (in analogy with other ratios in fluid mechanics such as Reynolds number or Prandtl number) to pin down the phase transition and critical end point to a crossover in strongly interacting nuclear matter between the hadron gas and quark and gluon plasma/liquid.

Item Type:Article
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© 2009 The American Physical Society.
We thank useful conversations and exchanges on eta/s with Jochen Wambach, Juan Maldacena, Dam Son, and Tom Cohen. This work has been supported by Grant Nos. FPA 2004-02602, 2005-02327, BSCH-PR34/0715875 (Spain)

Uncontrolled Keywords:Chiral Perturbation-Theory, Entropy Density, Viscosity, Ratio, Gas, Qcd
Subjects:Sciences > Physics
ID Code:21381
Deposited On:11 Jun 2013 15:14
Last Modified:24 Feb 2015 12:53

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