Gerald V. Dunne (Connecticut)

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Gerald V. Dunne (Connecticut)

October 20, 2021 @ 4:00 pm - 5:00 pm UTC+0

Resurgence and Extreme Field QFT

I propose a new approach to multi-loop QFT computations in strong background fields, based on an application of resurgent asymptotics to the extraction of strong-field and non-perturbative information from a limited number of terms of a weak-field expansion. The proposed method is demonstrated explicitly with the one-loop and two-loop expressions for the QED Euler-Heisenberg effective action, for which a surprising amount of strong-field and non-perturbative physics may be derived from just 10 terms of a weak magnetic field expansion. I will also discuss applications to inhomogeneous fields.


October 20, 2021
4:00 pm - 5:00 pm UTC+0
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