Zeldovich regularization

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Zeldovich regularization is a technique for handling expressions that diverge, such as certain integrals and series. It was introduced by Yakov Zeldovich in 1961 while he studied the norm of the Gamow wave function, which diverges because of an outgoing spherical wave. The method uses a Gaussian-type regulator to tame the infinities. For divergent integrals, a Gaussian factor is inserted to damp large contributions; for divergent series, a similar Gaussian damping is used. After regulating, the regulator is removed by taking an appropriate limit to obtain a finite result.