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Theory of Probability and Mathematical Statistics

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Minimization of the entropy for a mixture of standard and fractional Brownian motions


Authors: V. I. Makogin, Yu. S. Mishura and G. S. Zheleznyak
Journal: Theor. Probability and Math. Statist. 101 (2020), 193-215
MSC (2020): Primary 60G22, 60J65; Secondary 94A17
DOI: https://doi.org/10.1090/tpms/1121
Published electronically: January 5, 2021
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Abstract: An entropy-type functional for the sum of a Wiener process and a fractional Brownian motion with a drift is considered in this paper. A solution of the problem of minimization of such a functional is found in the space of $L_2$ functions. Properties of the norm of the solution are investigated and a version of the problem of minimization is considered in the space of constant functions. The $L_2$ continuity of the solution of minimization problem with respect to the Hurst index is shown as a corollary of the continuity of weighted Riemann–Liouville integral operators proved in the paper.


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Additional Information

V. I. Makogin
Affiliation: Institute of Stochastics, Ulm University, Ulm 89069, Germany
Email: vitalii.makogin@uni-ulm.de

Yu. S. Mishura
Affiliation: Department of Probability Theory, Statistics, and Actuarial Mathematics, Faculty for Mechanics and Mathematics, Kyiv Taras Shevchenko National University, Volodymyrs’ka Street, 64/13, Kyiv 01601, Ukraine
Email: myus@univ.kiev.ua

G. S. Zheleznyak
Affiliation: Department of Probability Theory, Statistics, and Actuarial Mathematics, Faculty for Mechanics and Mathematics, Kyiv Taras Shevchenko National University, Volodymyrs’ka Street, 64/13, Kyiv 01601, Ukraine
Email: hanna.zhelezniak@gmail.com

Keywords: Wiener process, fractional Brownian motion, Radon–Nikodym derivative, entropy functional, minimization, maximization
Received by editor(s): June 12, 2019
Published electronically: January 5, 2021
Article copyright: © Copyright 2020 American Mathematical Society