Abstract
We consider the evolutionary \(p\)-Laplacean system
in cylindrical domains of \( \mathbb R^{n}\times \mathbb R\), and prove the continuity of the spatial gradient \(Du\) under the Lorentz space assumption \(F\in L(n+2,1)\). When \(F\) is time independent the condition improves in \(F \in L(n,1)\). This is the limiting case of a result of DiBenedetto claiming that \(Du\) is Hölder continuous when \(F \in L^{q}\) for \(q>n+2\). At the same time, this is the natural nonlinear parabolic analog of a linear result of Stein, claiming the gradient continuity of solutions to the linear elliptic system \(\triangle u \in L(n,1)\) is continuous. New potential estimates are derived and moreover suitable nonlinear potentials are used to describe fine properties of solutions.
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Acknowledgments
The authors are supported by the ERC grant 207573 “Vectorial Problems” and by the Academy of Finland project “Regularity theory for nonlinear parabolic partial differential equations”. The authors also thank Paolo Baroni for remarks on a preliminary version of the paper and the institute Mittag-Leffer for hospitality in the frame of the program “Evolutionary problems”. Last but not least we thank the referee for the careful reading of the manuscript, and the suggestions, leading to a better presentation.
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Kuusi, T., Mingione, G. Borderline gradient continuity for nonlinear parabolic systems. Math. Ann. 360, 937–993 (2014). https://doi.org/10.1007/s00208-014-1055-1
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DOI: https://doi.org/10.1007/s00208-014-1055-1