Year: 2026
Type: preprint
Abstract: This paper establishes an interior $C^2$ estimate for solutions of \[ σ_2(D^2u)+α(x)σ_1(D^2u)=f(x,u,Du)>0, \] on the positive branch $Δu>0$, under the assumptions $α\ge0$ and $D^2α=βI$. Using one extra variable and a quartic correction, the equation is reduced to a quadratic Hessian equation in one higher dimension. The terms involving $D^2u$ cancel, so the interior estimate of Li--Wu \cite{LW} applies. The gradient-independent case is also treated. Finally, an example shows that an $L^\infty$ bound on $α$ alone is not enough.
Source: arXiv (Cornell University)
Authors: Ren, C. Y., Sun, X. L.
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7220987780