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arXiv 0901.4127math.PR
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一类非局部Dirichlet型的热核估计和Harnack不等式

Heat kernel estimates and Harnack inequalities for some Dirichlet forms with non-local part

Mohammud Foondun

摘要:

我们考虑由\sE(f,f)&=&{1/2} \int_{\bR^d} \sum_{i,j=1}^d a_{ij}(x)\frac{\partial f(x)}{\partial x_i} \frac{\partial f(x)}{\partial x_j} dx &+& \int_{\bR^d\times \bR^d}(f(y)-f(x))^2 J(x,y)dx dy给出的Dirichlet形式.在假设$\{a_{ij}\}$是对称的一致椭圆的条件下,并在非局部部分$J$上给出了Dirichlet形式热核的上下界.证明了关于$\sE$调和函数的Harnack不等式和正则性定理。

英文摘要:

We consider the Dirichlet form given by \sE(f,f)&=&{1/2}\int_{\bR^d}\sum_{i,j=1}^d a_{ij}(x)\frac{\partial f(x)}{\partial x_i} \frac{\partial f(x)}{\partial x_j} dx &+&\int_{\bR^d\times \bR^d} (f(y)-f(x))^2J(x,y)dxdy. Under the assumption that the $\{a_{ij}\}$ are symmetric and uniformly elliptic and with suitable conditions on $J$, the nonlocal part, we obtain upper and lower bounds on the heat kernel of the Dirichlet form. We also prove a Harnack inequality and a regularity theorem for functions that are harmonic with respect to $\sE$.

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