{"title":"On Some Properties of the Fractional Derivative of the Brownian Local Time","authors":"I. A. Ibragimov, N. V. Smorodina, M. M. Faddeev","doi":"10.1134/s0081543824010115","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p> We study the properties of the fractional derivative <span>\\(D_\\alpha l(t,x)\\)</span> of order <span>\\(\\alpha<1/2\\)</span> of the Brownian local time <span>\\(l(t,x)\\)</span> with respect to the variable <span>\\(x\\)</span>. This derivative is understood as the convolution of the local time with the generalized function <span>\\(|x|^{-1-\\alpha}\\)</span>. We show that <span>\\(D_\\alpha l(t,x)\\)</span> appears naturally in Itô’s formula for the process <span>\\(|w(t)|^{1-\\alpha}\\)</span>. Using the martingale technique, we also study the limit behavior of <span>\\(D_\\alpha l(t,x)\\)</span> as <span>\\(t\\to\\infty\\)</span>. </p>","PeriodicalId":54557,"journal":{"name":"Proceedings of the Steklov Institute of Mathematics","volume":"28 1","pages":""},"PeriodicalIF":0.4000,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Steklov Institute of Mathematics","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1134/s0081543824010115","RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
We study the properties of the fractional derivative \(D_\alpha l(t,x)\) of order \(\alpha<1/2\) of the Brownian local time \(l(t,x)\) with respect to the variable \(x\). This derivative is understood as the convolution of the local time with the generalized function \(|x|^{-1-\alpha}\). We show that \(D_\alpha l(t,x)\) appears naturally in Itô’s formula for the process \(|w(t)|^{1-\alpha}\). Using the martingale technique, we also study the limit behavior of \(D_\alpha l(t,x)\) as \(t\to\infty\).
期刊介绍:
Proceedings of the Steklov Institute of Mathematics is a cover-to-cover translation of the Trudy Matematicheskogo Instituta imeni V.A. Steklova of the Russian Academy of Sciences. Each issue ordinarily contains either one book-length article or a collection of articles pertaining to the same topic.