Quadratic expansions and partial regularity for fully nonlinear uniformly parabolic equations

Jean-Paul Daniel (1)

1 LJLL - Laboratoire Jacques-Louis Lions

For a parabolic equation associated to a uniformly elliptic operator, we obtain a $W^{3, \varepsilon}$ estimate, which provides a lower bound on the Lebesgue measure of the set on which a viscosity solution has a quadratic expansion. The argument combines parabolic $W^{2,\varepsilon}$ estimates with a comparison principle argument. As an application, we show, assuming the operator is $C^1$, that a viscosity solution is $C^{2,\alpha}$ on the complement of a closed set of Hausdorff dimension $\eps$ less than that of the ambient space, where the constant $\varepsilon>0$ depends only on the dimension and the ellipticity.

Mots clés: partial regularity; fully nonlinear parabolic equations; viscosity solutions

Domaines: Equations aux dérivées partielles [math.AP]

Jean-Paul Daniel. Quadratic expansions and partial regularity for fully nonlinear uniformly parabolic equations. Calculus of Variations and Partial Differential Equations, 2015, 54 (1), p. 183-216. ⟨hal-00862874v2⟩