6 research outputs found
Sharp Hessian estimates for fully nonlinear elliptic equations under relaxed convexity assumptions, oblique boundary conditions and applications
In this work we derive global estimates for viscosity solutions to fully
nonlinear elliptic equations under relaxed structural assumptions on the
governing operator which are weaker than convexity and oblique boundary
conditions and under suitable assumptions on the dat. Our approach makes use of
geometric tangential methods, which consists of importing "fine regularity
estimates" from a limiting profile, i.e., the Recession operator, associated
with the original second order one via compactness and stability procedures. As
a result, we devote a special attention to the borderline scenario. In such a
setting, we prove that solutions enjoy BMO type estimates for their second
derivatives. In the end, as another application of our findings, we obtain
Hessian estimates to obstacle type problems under oblique boundary conditions
and no convexity assumptions, which may have their own mathematical interest. A
density result in a suitable class of viscosity solutions will be also
addressed
Sharp regularity estimates for quasilinear evolution equations
We establish sharp geometric regularity estimates for bounded
weak solutions of evolution equations of -Laplacian type. Our approach is
based on geometric tangential methods, and makes use of a systematic
oscillation mechanism combined with an adjusted intrinsic scaling argument.Comment: 18 page