Issue |
EPL
Volume 92, Number 6, December 2010
|
|
---|---|---|
Article Number | 61001 | |
Number of page(s) | 6 | |
Section | The Physics of Elementary Particles and Fields | |
DOI | https://doi.org/10.1209/0295-5075/92/61001 | |
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
Received:
22
July
2010
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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