Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-10-26
Annals Phys. 249 (1996) 532-581
Physics
High Energy Physics
High Energy Physics - Phenomenology
50 pages, submitted to Ann. Phys. (N. Y.); diagrams coded as tex-macros; 5 figures available at: ftp://tpri6b.gsi.de/pub/kno
Scientific paper
10.1006/aphy.1996.0082
Some considerations about the importance of coherence effects for bremsstrahlung processes in non--equilibrium dense matter (Landau - Pomeranchuk - Migdal - effect) are presented. They are of particular relevance for the application to photon - and di-lepton production from high energy nuclear collisions, to gluon radiation in QCD transport, or parton kinetics and to neutrino and axion radiation from supernova explosion and from hot neutron stars. The soft behavior of the bremsstrahlung from a source described by classical transport models is discussed and pocket correction formulas for the in-matter radiation cross sections are suggested in terms of standard transport coefficients. The radiation rates are also discussed within a non--equilibrium quantum field theory (Schwinger - Kadanoff - Baym - Keldysh) formulation. A classification of diagrams and corresponding resummation in physically meaningful terms is proposed, which considers the finite damping width of all source particles in matter. This way each diagram in this expansion is already free from the infra--red divergences. Both, the correct quasi--particle and quasi--classical limits are recovered from this subset of graphs. Explicit results are given for dense matter in thermal equilibrium. The diagrammatic description may suggest a formulation of a transport theory that includes the propagation of off--shell particles in non--equilibrium dense matter.
Knoll Jörn
Voskresensky Dmitri . N.
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