We study the production of prompt photons in strongly coupled out-of-equilibrium super Yang-Mills plasma using the AdS/CFT correspondence. Our goal is to determine the photon emission spectrum at different stages of a thermalization process, which is modeled via the gravitational collapse of a thin spherical shell in ${\mathrm{AdS}}_5$ space. Particular emphasis is placed on the limit of large frequencies, which we are able to treat analytically.

• Received 17 July 2012

DOI:https://doi.org/10.1103/PhysRevD.86.081901