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η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound?

Publication ,  Journal Article
Demir, N; Bass, SA
Published in: Nuclear Physics A
November 1, 2009

Ultrarelativistic heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) are thought to have produced a state of matter called the quark-gluon plasma, characterized by a very small shear-viscosity to entropy-density ratio η / s, near the lower bound predicted for that quantity by AdS/CFT methods. As the produced matter expands and cools, it evolves through a phase described by a hadron gas with rapidly increasing η / s. We calculate η / s as a function of temperature in this phase both in and out of chemical equilibrium and find that its value poses a challenge for viscous relativistic hydrodynamics, which requires small values of η / s in order to successfully describe the collective flow observables at RHIC. We therefore conclude that the origin of the low viscosity matter at the RHIC must be in the partonic phase of the reaction. © 2009 Elsevier B.V.

Duke Scholars

Published In

Nuclear Physics A

DOI

ISSN

0375-9474

Publication Date

November 1, 2009

Volume

830

Issue

1-4

Start / End Page

733c / 736c

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 5101 Astronomical sciences
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

Citation

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Demir, N., & Bass, S. A. (2009). η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound? Nuclear Physics A, 830(1–4), 733c-736c. https://doi.org/10.1016/j.nuclphysa.2009.10.120
Demir, N., and S. A. Bass. “η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound?Nuclear Physics A 830, no. 1–4 (November 1, 2009): 733c-736c. https://doi.org/10.1016/j.nuclphysa.2009.10.120.
Demir N, Bass SA. η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound? Nuclear Physics A. 2009 Nov 1;830(1–4):733c-736c.
Demir, N., and S. A. Bass. “η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound?Nuclear Physics A, vol. 830, no. 1–4, Nov. 2009, pp. 733c-736c. Scopus, doi:10.1016/j.nuclphysa.2009.10.120.
Demir N, Bass SA. η / s of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound? Nuclear Physics A. 2009 Nov 1;830(1–4):733c-736c.
Journal cover image

Published In

Nuclear Physics A

DOI

ISSN

0375-9474

Publication Date

November 1, 2009

Volume

830

Issue

1-4

Start / End Page

733c / 736c

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 5101 Astronomical sciences
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences