Transient photon production in a QGP

Abstract

We discuss the shortcomings of a formula that has been used in the literature to compute the number of photons emitted by a hot or dense system during a finite time, and show that the transient effects it predicts for the photon rate are unphysical.

Comments: 4 pages, to appear in the proceedings of Hadron Physics - RANP 2004, Angra dos Reis, Brazil