Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-12-26
Phys.Rev.D77:126002,2008
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, no figures, accepted for publication in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.77.126002
In this paper we investigate radiation by an accelerated quark in a strongly coupled gauge theory via AdS/CFT correspondence. According to AdS/CFT dictionary, we can read off energy density or energy flux of the radiation from asymptotic gravitational field in AdS bulk sourced by an accelerated string trailing behind the quark. In the case of an oscillating quark with frequency $\Omega$, we show that the time averaged energy density is asymptotically isotropic and it falls off as $(g_{\text{YM}}^2 N)^{1/2} \Omega^4/R^{2}$ with distance $R$ from the source. In a toy model of a scattered quark by an external field, we simply estimate Poynting vector by the bremsstrahlung radiation and show that the energy flux is anisotropic outgoing radiation. Based on these investigations, we discuss the properties of strongly coupled gauge theory radiation in comparison with electromagnetic radiation.
Maeda Kengo
Okamura Takashi
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