Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-01-21
Phys.Rev.D81:126001,2010
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, 8 figures. v2: published version. v4: factor-of-two error corrected in the time-averaged angular distribution of the
Scientific paper
10.1103/PhysRevD.81.126001
Using gauge/gravity duality, we compute the energy density and angular distribution of the power radiated by a quark undergoing circular motion in strongly coupled ${\cal N}=4$ supersymmetric Yang-Mills (SYM) theory. We compare the strong coupling results to those at weak coupling, and find the same angular distribution of radiated power, up to an overall prefactor. In both regimes, the angular distribution is in fact similar to that of synchrotron radiation produced by an electron in circular motion in classical electrodynamics: the quark emits radiation in a narrow beam along its velocity vector with a characteristic opening angle $\alpha \sim 1/\gamma$. To an observer far away from the quark, the emitted radiation appears as a short periodic burst, just like the light from a lighthouse does to a ship at sea. Our strong coupling results are valid for any strongly coupled conformal field theory with a dual classical gravity description.
Athanasiou Christiana
Chesler Paul M.
Liu Hong
Nickel Dominik
Rajagopal Krishna
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