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Weak parabolic Harnack inequality and H\"older regularity for non-local Dirichlet forms
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In this paper we give equivalent conditions for the weak parabolic Harnack inequality for general regular Dirichlet forms without killing part, in terms of local heat kernel estimates or growth lemmas. With a tail estimate on the jump measure, we obtain from these conditions the H\"older continuity of caloric and harmonic functions. Our results generalize the theory of Chen, Kumagai and Wang, in the sense that the upper jumping smoothness condition is canceled. We also derive the complete forms of Harnack inequalities from the globally non-negative versions, and obtain continuity of caloric functions with worse tails.
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The parabolic Harnack inequality on non-local Dirichlet spaces in the view of pure analysis
For regular non-local Dirichlet forms without killing, the strong parabolic Harnack inequality is equivalent to the weak parabolic Harnack inequality plus upper jumping smoothness, proved analytically.
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