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On a two-phase free boundary condition for p-harmonic measures

机译:关于p调和措施的两相自由边界条件

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摘要

Let Omega(i) subset of R-n, i is an element of {1, 2}, be two (delta, r(0))-Reifenberg flat domains, for some 0 < delta < (delta) over cap and r(0) > 0, assume Omega(1) boolean AND Omega(2) = empty set and that, for some w subset of R-n and some 0 < r, w is an element of partial derivative Omega(1) boolean AND partial derivative Omega(2), partial derivative Omega(1) boolean AND B(w, 2r) = partial derivative Omega(2) boolean AND B(w, 2r). Let p, 1 < p < infinity, be given and let u(i), i is an element of {1, 2}, denote a non-negative p-harmonic function in u(i), assume that u(i), i is an element of {1, 2}, is continuous in <(Omega)over bar>(i) boolean AND B(w, 2r) and that u(i) = 0 partial derivative Omega(i) boolean AND B(w, 2r). Extend u(i) to B(w, 2r) by defining u(i) equivalent to 0 on B(w, 2r)Omega(i). Then there exists a unique finite positive Borel measure mu(i), i is an element of {1, 2}, on R-n, with support in partial derivative Omega(i) boolean AND B(w, 2r), such that if phi is an element of C-0(infinity) (B(w, 2r)), then integral(Rn) vertical bar del u(i)vertical bar(p-2) dx = -integral(Rn) phi d mu(i). Let Delta(w, 2r) = partial derivative Omega(1) boolean AND B(w, 2r) = partial derivative Omega(2) boolean AND B(w, 2r). The main result proved in this paper is the following. Assume that mu(2) is absolutely continuous with respect to mu(1) on Delta(w, 2r), d mu(2) = kd mu(1) for mu(1)-almost every point in Delta(w, 2r) and that log k is an element of V M O(Delta(w, r), mu(1)). Then there exists (delta) over tilde = (delta) over tilde (p, n) > 0, (delta) over tilde < (delta) over cap, such that if delta <= (delta) over tilde, then Delta(w, r/2) is Reifenberg flat with vanishing constant. Moreover, the special case p = 2, i.e., the linear case and the corresponding problem for harmonic measures, has previously been studied in Kenig and Toro (J Reine Angew Math 596:1-44, 2006).
机译:设Rn的Omega(i)子集,i是{1,2}的元素,是两个(delta,r(0))-Reifenberg平坦域,对于cap上的一些0 0,假设Omega(1)布尔AND Omega(2)=空集,并且对于Rn的w个子集和0 (i)布尔AND B(w,2r)中连续,并且u(i)= 0偏导数Omega(i)布尔AND B (w,2r)。通过在B(w,2r) Omega(i)上定义等于0的u(i)将u(i)扩展到B(w,2r)。然后在Rn上存在唯一的有限正Borel测度mu(i),i是{1,2}的元素,并有偏导数Omega(i)布尔AND B(w,2r)的支持,使得如果phi是C-0(无穷大)(B(w,2r))的元素,则积分(Rn)垂直线del u(i)垂直线(p-2) dx = -integral(Rn)phi d mu(i)。设Delta(w,2r)=偏导数Omega(1)布尔AND B(w,2r)=偏导数Omega(2)布尔AND B(w,2r)。本文证明的主要结果如下。假设mu(2)相对于Delta(w,2r)上的mu(1)是绝对连续的,mu(1)的d mu(2)= kd mu(1)-Delta(w,2r)中的几乎每个点),并且log k是VMO(Delta(w,r),mu(1))的元素。然后存在代字号上的(delta)=代字号上的(delta)(p,n)> 0,代字号上的tilde上的上限的delta),从而如果代字号上的delta <=(delta),则Delta(w ,r / 2)是具有消失常数的Reifenberg平面。此外,先前已经在Kenig和Toro中研究了特殊情况p = 2,即线性情况和相应的谐波测度问题(J Reine Angew Math 596:1-44,2006)。

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