伪Hermitian流形上Hessian算子的精确全局界
Sharp Global Bounds for the Hessian on Pseudo-Hermitian Manifolds
摘要:
我们发现了伪厄米流形上范数不等式的精确界,其中涉及水平导数的函数的所有二阶导数的L^2范数由次拉普拉斯算子的L^2范数控制。摄动使我们能够得到非散度型的亚椭圆型偏微分方程解的先验界。证明的方法是通过Bochner技术。在里奇曲率为非负的流形类中,我们的不等式证明了海森堡群是一个极值流形。
英文摘要:
We find sharp bounds for the norm inequality on a Pseudo-hermitian manifold, where the L^2 norm of all second derivatives of the function involving horizontal derivatives is controlled by the L^2 norm of the sub-Laplacian. Perturbation allows us to get a-priori bounds for solutions to sub-elliptic PDE in non-divergence form with bounded measurable coefficients. The method of proof is through a Bochner technique. The Heisenberg group is seen to be en extremal manifold for our inequality in the class of manifolds whose Ricci curvature is non-negative.
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