Gradient Correction to Photon Emission Rate at Strong Coupling
Abstract
We compute the correction to the photon emission rate in first order of shear components of fluid velocity gradients, σij, in near-equilibrium hydrodynamic plasma at strong coupling regime, using the real-time Schwinger-Keldysh formalism in AdS/CFT correspondence. Our result is an integral of an analytic expression. We observe that the gradient correction to the photon emission rate at strong coupling is about 0.3 - 0.4 times of the equilibrium rate in units of σij/T.
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