Majorization, 4G Theorem and Schrödinger perturbations

Abstract

Schrödinger perturbations of transition densities by singular potentials may fail to be comparable with the original transition density. For instance this is so for the transition density of a subordinator perturbed by any time-independent unbounded potential. In order to estimate such perturbations it is convenient to use an auxilary transition density as a majorant and the 4G inequality for the original transition density and the majorant. We prove the 4G inequality for the $1/2$-stable and inverse Gaussian subordinators, discuss the corresponding class of admissible potentials and indicate estimates for the resulting transition densities of Schrödinger operators. The connection of the transition densities to their generators is made via the weak-type notion of fundamental solution.

17 pages, editorial changes and some details added in proofs, to appear in Journal of Evolution Equations

References in corpus (1)

• Global estimates for kernels of Neumann series and Green's functions

Cited by in corpus (1)

• Kato classes for Lévy processes