Radiation from an accelerated quark via AdS/CFT

TL;DR

This paper uses AdS/CFT correspondence to analyze radiation emitted by an accelerated quark in a strongly coupled gauge theory, revealing isotropic energy density decay for oscillating quarks and anisotropic radiation in scattering scenarios.

Contribution

It provides a novel analysis of radiation patterns from accelerated quarks in strongly coupled theories using holographic duality, including isotropic and anisotropic cases.

Findings

Energy density from oscillating quark is isotropic and decays as 1/R^2.

Energy flux in scattering case is anisotropic, resembling bremsstrahlung.

Radiation properties differ from classical electromagnetic radiation.

Abstract

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.