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Asymptotic exponential moments of two-dimensional additive functionals above subcriticality
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Asymptotic exponential moments of two-dimensional additive functionals above subcriticality
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We introduce new asymptotic formulas for the exponential moments of rescaled additive functionals of two-dimensional Brownian motion, extending the analysis to parameter regimes that go beyond the subcritical case underlying distributional limits. As an application, we develop a probabilistic-analytic approximation for the two-dimensional Laplacian with a singular perturbation at the origin. This method describes the perturbed Laplacian by combining analytic characteristics of the Kallianpur-Robbins and Kasahara-Kotani laws.
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