Resummed relative entropy fixes the sign of asymptotic growth of EFT coefficients and signals instabilities, with the Schwinger effect in fermionic QED as a concrete example obtained via Euclidean-to-Minkowski analytic continuation.
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Thermodynamic consistency in thermal scalar EFTs requires the Wilson coefficient of the leading dimension-8 operator to be strictly positive.
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Bounds on nonlinear effective field theories via resurgent relative entropy
Resummed relative entropy fixes the sign of asymptotic growth of EFT coefficients and signals instabilities, with the Schwinger effect in fermionic QED as a concrete example obtained via Euclidean-to-Minkowski analytic continuation.
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Positivity bounds from thermal field theory entropy
Thermodynamic consistency in thermal scalar EFTs requires the Wilson coefficient of the leading dimension-8 operator to be strictly positive.