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arXiv 1505.04083math.PRmath.FA
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Ornstein-Uhlenbeck半群在$L_1$中的正则化

Regularization in $L_1$ for the Ornstein--Uhlenbeck semigroup

Joseph Lehec

摘要:

设$γ_n$是$\mathbb R^n$上的标准高斯测度,$(Q_t)$是Ornstein-Ulhenbeck半群. Eldan和Lee最近建立了对于积分$1$和任何时间$t$的每个非负函数$f$,以下尾部不等式成立:\[ γ_n ( \{ Q_t f > r \} ) \leq C_t \, \frac{ (\log \log r)^4 }{r \sqrt{\log r}} , \quad \forall r>1 \]其中$C_t$是取决于$t$但不取决于维数的常数。本文的目的是简化他们的部分论点,并删除$(\log \log r)^4$因素。

英文摘要:

Let $γ_n$ be the standard Gaussian measure on $\mathbb R^n$ and let $(Q_t)$ be the Ornstein--Ulhenbeck semigroup. Eldan and Lee recently established that for every non--negative function $f$ of integral $1$ and any time $t$ the following tail inequality holds true: \[ γ_n ( \{ Q_t f > r \} ) \leq C_t \, \frac{ (\log \log r)^4 }{r \sqrt{\log r}} , \quad \forall r>1 \] where $C_t$ is a constant depending on $t$ but not on the dimension. The purpose of the present paper is to simplify parts of their argument and to remove the $(\log \log r)^4$ factor.

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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