On limit point and limit circle classification for PT symmetric operators

Azizov, Tomas Ya; Trunk, Carsten GND

A prominent class of PT-symmetric Hamiltonians is H:= 1/2 p^2 + x^2 (ix)^N, for x \in \Gamma$ for some nonnegative number N. The associated eigenvalue problem is defined on a contour $\Gamma$ in a specific area in the complex plane (Stokes wedges), see [3,5]. In this short note we consider the case N=2 only. Here we elaborate the relationship between Stokes lines and Stokes wedges and well-known limit point/limit circle criteria from [11, 6, 10].

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Azizov, Tomas Ya / Trunk, Carsten: On limit point and limit circle classification for PT symmetric operators. 2014.

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