Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-06-17
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, 15 figures. v3: improved figures 1 and 3
Scientific paper
In heavy-ion collisions, quark-gluon plasma is likely to be produced with sizable initial pressure anisotropy, which may leave an imprint on electromagnetic observables. In order to model a strongly coupled anisotropic plasma, we use the AdS/CFT correspondence to calculate the current-current correlator of a weakly gauged U(1) subgroup of R symmetry in an N=4 super-Yang-Mills plasma with a (temporarily) fixed anisotropy. The dual geometry, obtained previously by Janik and Witaszczyk, contains a naked singularity which however permits purely infalling boundary conditions and therefore the usual definition of a retarded correlator. We obtain numerical results for the cases of wave vector parallel and orthogonal to the direction of anisotropy, and we compare with previous isotropic results. In the (unphysical) limit of vanishing frequency (infinite time) we obtain a vanishing DC conductivity for any amount of anisotropy, but the anisotropic AC conductivities smoothly approach the isotropic case in the limit of high frequencies. We also discuss hard photon production from an anisotropic plasma and compare with existing hard-loop resummed calculations.
Rebhan Anton
Steineder Dominik
No associations
LandOfFree
Electromagnetic signatures of a strongly coupled anisotropic plasma 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 Electromagnetic signatures of a strongly coupled anisotropic plasma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic signatures of a strongly coupled anisotropic plasma will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-696525