Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-12-16
New J.Phys.13:035006,2011
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, 6 figures, invited contribution to the New Journal of Physics Focus Issue "Strongly Correlated Quantum Fluids: From
Scientific paper
10.1088/1367-2630/13/3/035006
We propose a new and simple method of estimating the radiation due to an accelerated quark in a strongly coupled medium, within the framework of the AdS/CFT correspondence. In particular, we offer a heuristic explanation of the collimated nature of synchrotron radiation produced by a circling quark, which was recently studied in Phys.Rev.D81 (2010) 126001. The gravitational dual of such quark is a coiling string in AdS, whose backreaction on the spacetime geometry remains tightly confined, as if 'beamed' towards the boundary. While this appears to contradict conventional expectations from the scale/radius duality, we resolve the issue by observing that the backreaction of a relativistic string is reproduced by a superposition of gravitational shock waves. We further demonstrate that this proposal allows us to reduce the problem of computing the boundary stress tensor to merely calculating geodesics in AdS, as opposed to solving linearized Einstein's equations.
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