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arXiv · 2601.00177

Harnack Inequality for Nonlinear Equations Driven by the Normalized Infinity-Laplacian

Ahmed Mohammed·Carson Pocock
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Abstract

We establish interior Harnack inequalities for nonnegative viscosity solutions of \[ \Delta_\infty^N u=f(u)+g(u)|Du|^q,\qquad 0<q<2, \] under natural monotonicity, sign, and Keller--Osserman-type assumptions on the nonlinearities. We first prove a local Harnack inequality for positive supersolutions of a model equation with bounded zeroth-order and gradient coefficients; a family of exponential supersolutions shows that the range \(0<q<2\) is sharp. We then construct radial blow-up barriers and obtain a global estimate in terms of the distance to the boundary and the inverse of an associated Keller--Osserman integral. Combining this estimate with a comparison principle, positive regularization, and a Harnack-chain argument yields the desired inequality on every connected subdomain compactly contained in the ambient domain.

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Ahmed Mohammed, Carson Pocock. 2026-01-01. Harnack Inequality for Nonlinear Equations Driven by the Normalized Infinity-Laplacian. https://arxiv.org/abs/2601.00177

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