Volume 92, Number 6, December 2010
|Number of page(s)||6|
|Section||The Physics of Elementary Particles and Fields|
|Published online||21 January 2011|
An interpretation of the infrared singularity of the effective electromagnetic field
Department of Theoretical Physics, Physics Faculty, Moscow State University - 119991, Moscow, Russian Federation
Accepted: 11 December 2010
The problem of infrared divergence of the effective electromagnetic field produced by elementary particles is revisited using the nonequilibrium model of an electron interacting with low-temperature photons. A new scheme of infrared regularization is proposed which allows us to factorize the infrared contributions in multi-loop diagrams, and to sum the corresponding infinite series. The obtained result suggests that the infrared singularity of the effective field can be interpreted as a thermalization of the electron. It is shown that this thermalization is negligible in actual field measurements as it is completely dominated by the usual quantum spreading.
PACS: 12.20.-m – Quantum electrodynamics / 11.10.Wx – Finite-temperature field theory / 11.15.Bt – General properties of perturbation theory
© EPLA, 2010
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