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math.DG2019
Bottom of spectra and coverings
Werner Ballmann, Panagiotis Polymerakis
We discuss the behaviour of the bottom of the spectrum of scalar Schrödinger operators under Riemannian coverings.
math.DG2019
Equivariant discretizations of diffusions, random walks, and harmonic functions
Werner Ballmann, Panagiotis Polymerakis
For covering spaces and properly discontinuous actions with compatible diffusion processes, we discuss Lyons-Sullivan discretizations of the processes and the associated function t…