A remark on the essential self-adjointness for Klein-Gordon type operators

Published 28 Feb 2022 in math-ph, math.AP, math.FA, and math.MP | (2202.13499v1)

Abstract: Here we discuss a new simplified proof of the essential self-adjointness for formally self-adjoint differential operators of real principal type, previously proved by Vasy (2020) and Nakamura-Taira (2021). For simplicity, here we discuss the second order cases, i.e., Klein-Gordon type operators only.

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