Local regularity for solutions to singular and degenerate quasilinear parabolic equations

Abstract

The main purpose of this paper is to prove local Hölder continuity for weak solutions to quasilinear parabolic equations of $p$-Laplace type under finite integrability assumptions on the forcing, covering the supercritical singular range and the entire degenerate regime. The key ingredient is an $L^\infty$-valued temporal Hölder estimate of the solution after any fixed positive waiting time, which is achieved by coupling a time-rescaling argument with De Giorgi iteration. We also provide counterexamples involving forcing terms with weaker spatial integrability to show that even bounded continuous solutions with compatible data may possess no positive temporal Hölder exponent. In particular, these examples establish the sharpness of the spatial integrability threshold in the degenerate case. Finally, a separate counterexample is constructed to demonstrate that the temporal Lipschitz endpoint can fail for bounded continuous forcing when it depends on time.