期刊
PHYSICS LETTERS B
卷 831, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2022.137190
关键词
Nonperturbative QED; Strong fields; Anomalous magnetic moment; Spontaneous particle production
In this study, we evaluate the imaginary part of the effective action in an electric field, sourced by vacuum fluctuations of a charged particle with magnetic moment. The result is found to be convergent for all values of the gyromagnetic ratio and exhibits periodicity, with a cusp at g = 2. We also examine the relationship to the QED beta-function, which shows periodic behavior in g. Using this novel method, we confirm the presence of asymptotic freedom conditions and identify a wider range of g-values for which asymptotic freedom is present.
We evaluate for the inhomogeneous static electric Sauter step potential the imaginary part of the emerging homogeneous in electric field effective Euler-Heisenberg-Schwinger action sourced by vacuum fluctuations of a charged particle with magnetic moment of arbitrary strength. The result is convergent for all values of gyromagnetic ratio g, periodic in g, with a cusp at g = 2. We consider the relation to the QED beta-function which is also found to be periodic in g. We confirm presence of asymptotic freedom conditions using this novel method and document a wider range of g-values for which asymptotic freedom is present. (C) 2022 The Author(s). Published by Elsevier B.V.
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