Photon intensity interferometry of systems in local equilibrium

Using Quantum Field Theory we derive a general formula for the double inclusive spectra of photons radiated by a system in local equilibrium. The derived expression differs significantly from the one mostly used up to now in photon intensity interferometry of heavy-ion collisions. We present a covariant expression for double inclusive spectra adapted for usage in numerical simulations. Application to a schematic model with a Bjoerken type expansion gives strong evidence for the need of reinvestigating of photon-photon correlations for expanding sources. (orig.)11 refs.Available from TIB Hannover: RO 801(95-46) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman