We discuss the optimal regularity and nondegeneracy of a free boundary problem related to the fractional Laplacian. This work is related to, but addresses a different problem from, recent work of Caffarelli et al. (J Eur Math Soc (JEMS) 12(5):1151–1179, 2010). A variant of the boundary Harnack inequality is also proved, where it is no longer required that the function be zero along the boundary.
机构:
South China Agr Univ, Dept Math, Guangzhou 510642, Guangdong, Peoples R ChinaSouth China Agr Univ, Dept Math, Guangzhou 510642, Guangdong, Peoples R China
Jin, Lingyu
Li, Yan
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Baylor Univ, Dept Math, Waco, TX 76706 USASouth China Agr Univ, Dept Math, Guangzhou 510642, Guangdong, Peoples R China