Gauge-invariant entire-function regulators of the covariant Laplace-Beltrami operator yield UV-finite nonlocal QFTs with exponential damping and no additional singularities.
H¨ ormander,The Analysis of Linear Partial Differen- tial Operators I: Distribution Theory and Fourier Anal- ysis, 2nd ed
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On Gauge-Invariant Entire-Function Regulators and UV Finiteness in NonLocal Quantum Field Theory
Gauge-invariant entire-function regulators of the covariant Laplace-Beltrami operator yield UV-finite nonlocal QFTs with exponential damping and no additional singularities.