关于凸体上线性泛函的次高斯估计的注记
A note on subgaussian estimates for linear functionals on convex bodies
摘要:
本文给出了Klartag关于凸体上几乎亚高斯线性泛函存在性的一个结果的另一种证明。如果$K$是${\mathbb R}^n$中的凸体,体积为1,质心在原点,则存在$x\neq 0$使得对于所有$t\gr 1$都有$$|\{y\in K: |< y,x> |\gr t\|<\cdot, x>\|_1\}|\ls\exp (-ct^2/\log^2(t+1))$$,其中$c>0$是绝对常数。证明是基于对$L_q$ --$K$的质心体的研究。类似的结果适用于一般的对数凹措施。
英文摘要:
We give an alternative proof of a recent result of Klartag on the existence of almost subgaussian linear functionals on convex bodies. If $K$ is a convex body in ${\mathbb R}^n$ with volume one and center of mass at the origin, there exists $x\neq 0$ such that $$|\{y\in K: |< y,x> |\gr t\|<\cdot, x>\|_1\}|\ls\exp (-ct^2/\log^2(t+1))$$ for all $t\gr 1$, where $c>0$ is an absolute constant. The proof is based on the study of the $L_q$--centroid bodies of $K$. Analogous results hold true for general log-concave measures.
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。