Non-negativity of resummed relative entropy imposes sign constraints on coefficients in nonlinear electrodynamics EFTs and diagnoses instabilities in strong coupling.
Higher-loop Euler-Heisenberg transseries structure
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Inhomogeneous background fields convert Borel poles in the effective action to branch points and introduce new ones, allowing resurgent extrapolation to recover non-perturbative information from perturbative input more accurately than WKB or locally constant approximations.
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Bounds on nonlinear electrodynamics via resummed relative entropy
Non-negativity of resummed relative entropy imposes sign constraints on coefficients in nonlinear electrodynamics EFTs and diagnoses instabilities in strong coupling.
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Resurgence of the Effective Action in Inhomogeneous Fields
Inhomogeneous background fields convert Borel poles in the effective action to branch points and introduce new ones, allowing resurgent extrapolation to recover non-perturbative information from perturbative input more accurately than WKB or locally constant approximations.