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arXiv 1504.02673math.APmath.DS
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格点上抛物格林函数的渐近性

Asymptotics of parabolic Green's functions on lattices

Pavel Gurevich

摘要:

对于抛物型空间离散方程,我们考虑格林函数,也称为热核格。我们得到了它们关于时间变量$t$的任意阶幂的渐近展开式,并在整个格上一致地估计了它们的渐近展开式。所考虑的空间离散(差分)算子是具有任意$d\in\mathbb N$的$\mathbb R^d$中任意偶数阶连续强椭圆微分算子(常系数)的有限差分近似。这种通用性,除了数值和确定性晶格动力学的应用,允许一个获得高阶渐近的连续时间随机游动$\mathbb Z^d$和其他晶格的转移概率函数。

英文摘要:

For parabolic spatially discrete equations, we consider Green's functions, also known as heat kernels on lattices. We obtain their asymptotic expansions with respect to powers of time variable $t$ up to an arbitrary order and estimate the remainders uniformly on the whole lattice. The spatially discrete (difference) operators under consideration are finite-difference approximations of continuous strongly elliptic differential operators (with constant coefficients) of arbitrary even order in $\mathbb R^d$ with arbitrary $d\in\mathbb N$. This genericity, besides numerical and deterministic lattice-dynamics applications, allows one to obtain higher-order asymptotics of transition probability functions for continuous-time random walks on $\mathbb Z^d$ and other lattices.

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