Heat Kernel Estimates for Random Walks with Killing on Transient Graphs

Abstract

We give matching two-sided estimates for heat kernels obtained from Schrödinger operators $\Delta +W$ on weighted graphs. The graphs we consider are transient and admit two-sided sub-Gaussian heat kernel estimates for the Laplacian $\Delta$, and the potentials $W$ decay to zero at infinity. We offer two proofs for one of our main results: one using the Feynman-Kac formula, and one without using it. Our results apply to fractal-type graphs such as graphical Sierpinski carpets, among other examples.

arXiv comment22 pages, 2 figures