{"title":"Tightness for thick points in two dimensions","authors":"J. Rosen","doi":"10.1214/23-ejp910","DOIUrl":null,"url":null,"abstract":"Let $W_{t}$ be Brownian motion in the plane started at the origin and let $ \\theta$ be the first exit time of the unit disk $D_{1}$. Let \\[\\mu_{ \\theta } ( x,\\epsilon) =\\frac{1}{\\pi\\epsilon^{ 2} }\\int_{0}^{ \\theta }1_{\\{ B( x,\\epsilon)\\}}( W_{t})\\,dt,\\] and set $\\mu^{ \\ast}_{ \\theta } (\\epsilon)=\\sup_{x\\in D_{1}}\\mu_{ \\theta } ( x,\\epsilon)$. We show that \\[\\sqrt{\\mu^{\\ast}_{\\theta} (\\epsilon)}-\\sqrt{2/\\pi} \\left(\\log \\epsilon^{-1}- \\frac{1}{2}\\log\\log \\epsilon^{-1}\\right)\\] is tight.","PeriodicalId":50538,"journal":{"name":"Electronic Journal of Probability","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2022-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electronic Journal of Probability","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1214/23-ejp910","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"STATISTICS & PROBABILITY","Score":null,"Total":0}
引用次数: 0
Abstract
Let $W_{t}$ be Brownian motion in the plane started at the origin and let $ \theta$ be the first exit time of the unit disk $D_{1}$. Let \[\mu_{ \theta } ( x,\epsilon) =\frac{1}{\pi\epsilon^{ 2} }\int_{0}^{ \theta }1_{\{ B( x,\epsilon)\}}( W_{t})\,dt,\] and set $\mu^{ \ast}_{ \theta } (\epsilon)=\sup_{x\in D_{1}}\mu_{ \theta } ( x,\epsilon)$. We show that \[\sqrt{\mu^{\ast}_{\theta} (\epsilon)}-\sqrt{2/\pi} \left(\log \epsilon^{-1}- \frac{1}{2}\log\log \epsilon^{-1}\right)\] is tight.
期刊介绍:
The Electronic Journal of Probability publishes full-size research articles in probability theory. The Electronic Communications in Probability (ECP), a sister journal of EJP, publishes short notes and research announcements in probability theory.
Both ECP and EJP are official journals of the Institute of Mathematical Statistics
and the Bernoulli society.