Finite lifetime effects on the photon production from a quark-gluon plasma

Abstract

We use the real-time Keldysh formalism to investigate finite lifetime effects on the photon emission from a quark-gluon plasma (QGP). We provide an ansatz which eliminates the divergent contribution from the vacuum polarization and renders the photon spectrum UV-finite if the time evolution of the QGP is described in a suitable manner.

Comments: Contributed to the proceedings of the XLVII International Winter Meeting on Nuclear Physics, Bormio (Italy), Jan. 26-30, 2009