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Exact Solutions for the Singularly Perturbed Riccati Equation and Exact WKB Analysis

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arxiv 2008.06492 v2 pith:2JZVEC4Y submitted 2020-08-14 math.CA math-phmath.CVmath.MP

classification math.CAmath-phmath.CVmath.MP
keywords exactsolutionshbarcomplexequationexistenceperturbedprove
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abstract

The singularly perturbed Riccati equation is the first-order nonlinear ODE $\hbar \partial_x f = af^2 + bf + c$ in the complex domain where $\hbar$ is a small complex parameter. We prove an existence and uniqueness theorem for exact solutions with prescribed asymptotics as $\hbar \to 0$ in a halfplane. These exact solutions are constructed using the Borel-Laplace method; i.e., they are Borel summations of the formal divergent $\hbar$-power series solutions. As an application, we prove existence and uniqueness of exact WKB solutions for the complex one-dimensional Schr\"odinger equation with a rational potential.

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Cited by 2 Pith papers

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    Borel-summed WKB solutions of quantum Seiberg-Witten equations are matched, numerically, to GMN open TBA solutions for the Weber and modified Mathieu equations.

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