Abstract
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.
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