奇异摄动 Riccati 方程的精确解与精确 WKB 分析
Exact Solutions for the Singularly Perturbed Riccati Equation and Exact WKB Analysis
AI总结:
本文用 Borel–Laplace 方法构造并刻画奇异摄动 Riccati 方程在半平面内具有指定渐近性的精确解,并据此证明有理势复一维 Schrödinger 方程精确 WKB 解的存在唯一性。
摘要:
奇异摄动 Riccati 方程是复域中的一阶非线性 ODE(常微分方程)$\hbar \partial_x f = af^2 + bf + c$,其中 $\hbar$ 是一个小复参数。我们证明了在半平面内当 $\hbar \to 0$ 时具有指定渐近性的精确解的存在唯一性定理。这些精确解利用 Borel–Laplace 方法构造;换言之,它们是形式发散的 $\hbar$ 幂级数解的 Borel 求和。作为应用,我们证明了具有有理势的复一维 Schrödinger 方程精确 WKB 解的存在性与唯一性。
英文摘要:
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 Schrödinger equation with a rational potential.
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