DOI 10.1007/s100520000440
Leontovich relations in thermal field theory
Theory Division, CERN, 1211 Geneva 23, Switzerland
Received: 17 April 2000 / Published online: 6 July 2000 - © Springer-Verlag 2000
Abstract
The application of generalized Kramers-Kronig relations, the so-called
Leontovich relations, to thermal field theory is discussed. Medium effects
contained in the full, thermal propagators can easily be taken into account
by this method. As examples the collisional energy loss of a charged
particle in a relativistic plasma and the radiation of energetic photons from
a quark-gluon plasma are considered. Within the leading logarithmic
approximation the results based on the hard thermal loop resummation
technique are reproduced easily. However, the method presented here
is more general and provides exact expressions, which allow in
principle non-perturbative calculations.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
