On Hölder continuity and equivalent formulation of intrinsic Harnack estimates for an anisotropic parabolic degenerate prototype equation

On Hölder continuity and equivalent formulation of intrinsic Harnack estimates for an anisotropic parabolic degenerate prototype equation

We give a proof of H ̈older continuity for bounded local weak solutions to the equation ut =\sum_{i=1}^N (|u_{x_i}|^{p_i−2} u_{x_i} )_{x_i} , in Ω × [0, T], with Ω ⊂⊂ R^N under the condition 2 < pi < p(1 + 2/N) for each i = 1, .., N, being p the harmonic mean of the pi's, via recently discovered intrinsic Harnack estimates. Moreover we establish equivalent forms of these Harnack estimates within the proper intrinsic geometry.

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  • S. Antontsev, S. Shmarev: Evolution PDEs with nonstandard growth conditions, Atlantis Studies in Differential Equations 4, Atlantis Press, Paris (2015).
  • L. Boccardo, P. Marcellini: L∞-Regularity for Variational Problems with Sharp Non Standard Growth Conditions, Bollettino della Unione Matematica Italiana, 7 (4-A), 219-226, 1990.
  • P. Bousquet, L. Brasco: Lipschitz regularity for orthotropic functionals with nonstandard growth conditions, Rev. Mat. Iberoam, Electronically published on April 7, 2020.
  • S. Ciani, V. Vespri: A new short proof of regularity for local weak solutions for a certain class of singular parabolic equations, Rend. Mat. Appl., 41 (7), 251-264, 2020.
  • S. Ciani, V. Vespri: An Introduction to Barenblatt Solutions for Anisotropic p-Laplace Equations, Anomalies in partial differential equations Springer Indam Series. Cicognani, Del Santo, Parmeggiani and Reissig Editors. In press
  • S. Ciani, S. Mosconi and V. Vespri: Parabolic Harnack estimates for anisotropic slow diffusion, (https://arxiv.org/pdf/2012.09685.pdf).
  • E. DiBenedetto: Degenerate Parabolic Equations, Universitext, Springer-Verlag, New York (1993).
  • E. DiBenedetto, U. Gianazza and V. Vespri: Harnack estimates for quasi-linear degenerate parabolic differential equations, Acta Mathematica, 200 (2), 181-209, 2008.
  • E. DiBenedetto, U. Gianazza and V. Vespri: Alternative forms of the Harnack inequality for non-negative solutions to certain degenerate and singular parabolic equations, Rendiconti Lincei-Matematica e Applicazioni, 20 (4), 369-377, 2009.
  • E. DiBenedetto, U. Gianazza and V. Vespri: Harnack’s Inequality for Degenerate and Singular Parabolic Equations, Springer Monographs in Mathematics, Springer-Verlag, New York (2012).
  • E. DiBenedetto, U. Gianazza and V. Vespri: Remarks on Local Boundedness and Local Holder Continuity of Local Weak Solutions to Anisotropic p-Laplacian Type Equations, Journal of Elliptic and Parabolic Equations 2 (1-2), 157-169, 2016.
  • F. G. Düzgün, P. Marcellini and V. Vespri: Space expansion for a solution of an anisotropic p-Laplacian equation by using a parabolic approach, Riv. Mat. Univ. Parma, 5 (1), 2014.
  • F. G. Düzgün, S. Mosconi and V. Vespri: Anisotropic Sobolev embeddings and the speed of propagation for parabolic equations, Journal of Evolution Equations, 19 (3), 845-882, 2019.
  • M. Eleuteri, P. Marcellini and E. Mascolo: Regularity for scalar integrals without structure conditions, Advances in Calculus of Variations, 2018.
  • M. Giaquinta: Growth conditions and regularity, a counterexample, Manuscripta Mathematica, 59 (2), 245-248, 1987.
  • J. Haškovec, C. Schmeiser: A note on the anisotropic generalizations of the Sobolev and Morrey embedding theorems, Monatshefte für Mathematik 158 (1), 71-79, 2009.
  • I. M. Kolodii: The boundedness of generalized solutions of elliptic differential equations, Moscow Univ. Math. Bull., 25, 31–37, 1970.
  • A. G. Korolev: Boundedness of generalized solutions of elliptic differential equations, Russian Math. Surveys, 38, 186–187, 1983.
  • P. Marcellini: Un example de solution discontinue d’un probleme variationnel dans ce cas scalaire, preprint, Istituto Matematico “U. Dini”, Universitá di Firenze, 88, 1987.
  • P. Marcellini: Regularity of minimizers of integrals of the calculus of variations with non standard growth conditions, Archive for Rational Mechanics and Analysis, 105 (3), 267-284, 1989.
  • P. Marcellini: Regularity and existence of solutions of elliptic equations with (p, q)-growth conditions, Journal of Differential Equations, 90 (1), 1-30, 1991.
  • P. Marcellini: Regularity under general and p, q-growth conditions, Dicrete Contin. Dyn. Syst. Ser., 13, 2009–2031, 2020.
  • Y. Mingqi, L. Xiting: Boundedness of solutions of parabolic equations with anisotropic growth conditions, Canadian Journal of Mathematics, 49 (4), 798-809, 1997.
  • J. Moser: A Harnack inequality for parabolic differential equations, Communications on Pure and Applied Mathematics, 17 (1), 101-134, 1964.
  • B. Pini: Sulla soluzione generalizzata di Wiener per il primo problema di valori al contorno nel caso parabolico, Rendiconti del Seminario Matematico della Universita di Padova, 23, 422-434, 1954.
  • M. Ruzicka: Electrorheological fluids: modeling and mathematical theory, Springer Science and Business Media, 2000.
  • I. I. Skrypnik: Removability of an isolated singularity for anisotropic elliptic equations with absorption, Sbornik: Mathematics, 199 (7), 1033-1050, 2008.
  • N. N. Ural’tseva, A. B. Urdaletova: The boundedness of the gradients of generalized solutions of degenerate quasilinear nonuniformly elliptic equations, Vest. Leningr. Univ. Math, 16, 263-270, 1984.