Borel Summation of the Derivative Expansion and Effective Actions

Details Borel Summation of the Derivative Expansion and Effective Actions Borel Summation of the Derivative Expansion and Effective Actions

1999-02-09

arxiv.org/abs/hep-th/9902064v1

Phys.Rev. D60 (1999) 065002

Physics

High Energy Physics

High Energy Physics - Theory

18 pp, Revtex, 2 figs

Scientific paper

10.1103/PhysRevD.60.065002

We give an explicit demonstration that the derivative expansion of the QED effective action is a divergent but Borel summable asymptotic series, for a particular inhomogeneous background magnetic field. A duality transformation B\to iE gives a non-Borel-summable perturbative series for a time dependent background electric field, and Borel dispersion relations yield the non-perturbative imaginary part of the effective action, which determines the pair production probability. Resummations of leading Borel approximations exponentiate to give perturbative corrections to the exponents in the non-perturbative pair production rates. Comparison with a WKB analysis suggests that these divergence properties are general features of derivative expansions and effective actions.

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