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Closed-form weak-field expansion of two-loop Euler-Heisenberg Lagrangians

G. V. Dunne, A. Huet, D. Rivera, C. Schubert

hep-tharXiv:hep-th/0609065

Abstract

We obtain closed-form expressions, in terms of the Faulhaber numbers, for the weak-field expansion coefficients of the two-loop Euler-Heisenberg effective Lagrangians in a magnetic or electric field. This follows from the observation that the magnetic worldline Green's function has a natural expansion in terms of the Faulhaber numbers.

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