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

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

2009-07-24

arxiv.org/abs/0907.4333v2

Nucl.Phys.A830:733c-736c,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures - Revised version: To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxv

Scientific paper

10.1016/j.nuclphysa.2009.10.120

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 $\eta/s$, 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 $\eta/s$. We calculate $\eta/s$ 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 $\eta/s$ 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.

Affiliated with

Also associated with

No associations

Rating

$η/s$ of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with $η/s$ of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and $η/s$ of a Relativistic Hadron Gas at RHIC: Approaching the AdS/CFT bound? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-310735