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Projections of scaled bessel processes

Kardaras, Constantinos ORCID: 0000-0001-6903-4506 and Ruf, Johannes ORCID: 0000-0003-3616-2194 (2019) Projections of scaled bessel processes. Electronic Communications in Probability, 24. ISSN 1083-589X

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Identification Number: 10.1214/19-ECP246


Let X and Y denote two independent squared Bessel processes of dimension m and n-m, respectively, with n ≥ 2 and m ∈ [0, n), making X+Y a squared Bessel process of dimension n. For appropriately chosen function s, the process s(X + Y) is a local martingale. We study the representation and the dynamics of s(X + Y), projected on the filtration generated by X. This projection is a strict supermartingale if, and only if, m < 2. The finite-variation term in its Doob-Meyer decomposition only charges the support of the Markov local time of X at zero.

Item Type: Article
Official URL:
Additional Information: © 2019 The Authors
Divisions: Statistics
Subjects: H Social Sciences > HA Statistics
Q Science > QA Mathematics
Date Deposited: 04 Jun 2019 11:24
Last Modified: 30 May 2024 03:21

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