On complex-time heat kernels of fractional Schrödinger operators via Phragmén-Lindelöf principle

preprint2022arXivOpen access

Abstract

We consider fractional Schrödinger operators with possibly singular potentials and derive certain spatially averaged estimates for its complex-time heat kernel. The main tool is a Phragmén-Lindelöf theorem for polynomially bounded functions on the right complex half-plane. The interpolation leads to possibly nonoptimal off-diagonal bounds.

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