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arXiv 0907.0762math.PR
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Poincaré不等式与线性扩散方程首中时的指数可积性

Poincaré inequality and exponential integrability of hitting times for linear diffusions

D. Loukianova, O. Loukianov, Sh. Song

摘要:

设$X$是一个正则线性连续正常返马氏过程,其状态空间为$\R$,尺度函数为$S$,速度测度为$m$ .对$a\in \R$记为B^+_a&= \sup_{x\geq a} \m(]x,+ \infty [)(S(x)-S(a))B^-_a&= \sup_{x\leq a} \m(]- \infty ;x[)(S(a)-S(x))我们研究了$B^+_a$,$B^-_a$,$X$的首中时$T_a$的指数矩,$X$的Dirichlet型的Hardy和Poincaré不等式之间的一些特征关系.作为推论,我们建立了首中时的指数矩的存在性与$X$的生成元的谱隙之间的等价性。

英文摘要:

Let $X$ be a regular linear continuous positively recurrent Markov process with state space $\R$, scale function $S$ and speed measure $m$. For $a\in \R$ denote B^+_a&=\sup_{x\geq a} \m(]x,+\infty[)(S(x)-S(a)) B^-_a&=\sup_{x\leq a} \m(]-\infty;x[)(S(a)-S(x)) We study some characteristic relations between $B^+_a$, $B^-_a$, the exponential moments of the hitting times $T_a$ of $X$, the Hardy and Poincaré inequalities for the Dirichlet form associated with $X$. As a corollary, we establish the equivalence between the existence of exponential moments of the hitting times and the spectral gap of the generator of $X$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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