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arXiv 1709.03120math.AP
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薄障碍问题的直接上围不等式及其应用

Direct epiperimetric inequalities for the thin obstacle problem and applications

Maria Colombo, Luca Spolaor, Bozhidar Velichkov

摘要:

对于薄障碍物问题,我们用一种新的直接方法证明了在任意维上,频率为$\frac32$的Weiss能量和$2m$对$m\in \mathbb N$的Weiss能量满足一个上围不等式,后者是对数型的.特别是,在从经典语句的差异,我们不假设任何先验的密切性,一类特殊的齐次函数。在维数$2$中,我们还证明了在任意自由边界点上的上围不等式。作为第一个应用程序,我们提高了一套允许的频率爆破,以前被称为$λ\in \{\frac32\} \cup [2,\infty)$,我们分类的全球$λ$ -齐次极小,与$λ\in [\frac32,2+c]\cup\bigcup_{m\in \mathbb N}(2m-c_m^-,2m+c_m^+)$,显示作为一个结果,频率$\frac32$和$2m$是孤立的。其次,我们给出了Athanasopoulos-Caffarelli-Salsa(Amer. J. Math.,130(2)(2008),485-498)和Garofalo-Petrosyan(发明。数学、177(2)(2009),415-461)对于奇点,借助于对数类型的上周边不等式,其也首次适用于薄障碍物自由边界的所有奇点。特别地,我们通过一个显式的对数连续模改进了频率为$2m$的奇异集的$C^1$正则性。

英文摘要:

For the thin obstacle problem, we prove by a new direct method that in any dimension the Weiss' energies with frequency $\frac32$ and $2m$, for $m\in \mathbb N$, satisfy an epiperimetric inequality, in the latter case of logarithmic type. In particular, at difference from the classical statements, we do not assume any a priori closeness to a special class of homogeneous functions. In dimension $2$, we also prove the epiperimetric inequality at any free boundary point. As a first application, we improve the set of admissible frequencies for blow ups, previously known to be $λ\in \{\frac32\} \cup [2,\infty)$, and we classify the global $λ$-homogeneous minimizers, with $λ\in [\frac32,2+c]\cup\bigcup_{m\in \mathbb N}(2m-c_m^-,2m+c_m^+)$, showing as a consequence that the frequencies $\frac32$ and $2m$ are isolated. Secondly, we give a short and self-contained proof of the regularity of the free boundary previously obtained by Athanasopoulos-Caffarelli-Salsa (Amer. J. Math., 130(2) (2008), 485-498) for regular points and Garofalo-Petrosyan (Invent. Math., 177(2) (2009), 415-461) for singular points, by means of an epiperimetric inequality of logarithmic type which applies for the first time also at all singular points of thin-obstacle free boundaries. In particular we improve the $C^1$ regularity of the singular set with frequency $2m$ by an explicit logarithmic modulus of continuity.

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