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Exponentially Small Splitting of Separatrices, Matching in the Complex Plane and Borel Summation
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We investigate separatrix splitting in rapidly forced systems, taking the standard map as an example. This effect is exponentially small and rather subtle to compute precisely. In order to do so, we use a technique that has been developed for analysing asymptotics beyond all orders in moving interface problems. We obtain a recent asymptotic result of Lazutkin et al. for the separatrices crossing angle. In addition, using Borel summation, the numerical prefactor of the exponentially small term is related to the asymptotic behavior of the coefficients of a standard asymptotic expansion.
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