Closed-form weak-field expansion of two-loop Euler-Heisenberg Lagrangians
G. V. Dunne, A. Huet, D. Rivera, C. Schubert
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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