The classical Michael-Simon and Allard inequality is a Sobolev inequality for functions defined on a submanifold of Euclidean space. It is governed by a universal constant independent of the manifold, but displays on the right-hand side an additional $L^p$ term weighted by the mean curvature of the underlying manifold. We prove here a fractional version of this inequality on hypersurfaces of Euclidean space that are boundaries of convex sets. It involves the Gagliardo semi-norm of the function, as well as its $L^p$ norm weighted by the fractional mean curvature of the hypersurface.
As an application, we establish a new upper bound for the maximal time of existence in the smooth fractional mean curvature flow of a convex set. The bound depends on the perimeter of the initial set instead of on its diameter.
Lojasiewicz--Simon gradient inequalities for the harmonic map energy function
我们应用作者在arXiv:1510.03817中提出的抽象梯度不等式证明了Lojasiewicz-Simon梯度不等式,它利用索伯列夫空间对闭黎曼流形之间的映射施加最小正则性要求。我们的调和映射能量函数的Lojasiewicz-Simon梯度不等式推广了Kwon(2002),Liu and Yang(2010),Simon(1983,1985)和Topping(1997)的结果。
Lojasiewicz-Simon gradient inequalities for analytic and Morse-Bott functions on Banach spaces
我们证明了巴拿赫空间上解析泛函的Lojasiewicz-Simon梯度不等式的几个抽象版本,推广了这个不等式的以前的抽象版本,削弱了他们的假设,特别是著名的无穷维版本的梯度不等式,由于Lojasiewicz证明了西蒙(1983)。我们还证明了当泛函为Morse-Bott时,Lojasiewicz-Simon梯度不等式的最优指数是得到的,改进了Chill(2003,2006),Haraux and Jendoubi(2007)和Simon(1996)的类似结果。在我们的文章arXiv:1903.01953中,我们应用抽象的Lojasiewicz-Simon梯度不等式证明了调和映射能量泛函的Lojasiewicz-Simon梯度不等式,该能量泛函使用索伯列夫空间,对闭黎曼流形之间的映射施加最小正则性要求。调和映射能量泛函的这些不等式推广了Kwon(2002)、Liu and Yang(2010)、Simon(1983,1985)和Topping(1997)的不等式。在我们的专著arXiv:1510.03815中,我们证明了Lojasiewicz-Simon梯度不等式耦合杨-米尔斯能量函数使用索伯列夫空间施加最小的正则性要求对连接和部分。这些不等式推广了第一作者(arXiv:1409.1525中的定理23.1和23.17)关于任意维基流形和拉德(1992)关于二维和三维基流形的纯杨-米尔…
Logarithmic-Sobolev inequalities on non-compact Euclidean submanifolds: sharpness and rigidity
Mathematisches Institute, Universit\"at Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;Department of Economics, Babe s-Bolyai University, Str. Teodor Mihali 58-60, 400591 Cluj-Napoca, Romania \& Institute of Applied Mathematics, \'Obuda University, B\'ecsi \'ut 96/B, 1034 Budapest, Hungary
流形M上的一个黎曼度量导出了闭路空间LM上依赖于索伯列夫空间参数s的黎曼度量族。这些度量的连接和曲率形式在伪微分算子中取值。利用s=0,1联络和Wodzicki-Chern-Simons剩余,我们发展了一个Wodzicki-Chern-Simons类的理论.这些类区分了M = S^2 x S^3上某些圆作用的光滑同伦类型,并暗示Diff(M)的基本群是无限的.