2023 Impact factor 4.2
Particles and Fields
Eur. Phys. J. C16, 513-518
DOI 10.1007/s100520000440

Leontovich relations in thermal field theory

M.H. Thoma

Theory Division, CERN, 1211 Geneva 23, Switzerland

Received: 17 April 2000 / Published online: 6 July 2000 - © Springer-Verlag 2000

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