Diagnostics of plasma photoemission at strong coupling.

BABIKER HASSANAIN, MARTIN SCHVELLINGER

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Lugar: New York; Año: 2012 vol. 85 p. 1 - 5

0556-2821

We compute the spectrum of photons emitted by the finite-temperature large-N SU(N) ${cal {N}}=4$ supersymmetric Yang-Mills plasma coupled to electromagnetism, at strong yet finite ´t Hooft coupling. We work in the holographic dual description, extended by the inclusion of the full set of ${cal{O}}(alpha´^3)$ type IIB string theory operators that correct the minimal supergravity action. We find that, as the t´ Hooft coupling decreases, the peak of the spectrum increases, and the momentum of maximal emission shifts towards the infra-red, as expected from weak-coupling computations. The total number of emitted photons also increases as the ´t Hooft coupling weakens.