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Subexponential potential asymptotics with applications

Part of: Mathematical economics Special processes

Published online by Cambridge University Press:  13 June 2022

Victoria Knopova  and
Zbigniew Palmowski Open the ORCID record for Zbigniew Palmowski [Opens in a new window]
Victoria Knopova*
Affiliation:
Kyiv National Taras Shevchenko University
Zbigniew Palmowski*
Affiliation:
Wrocław University of Science and Technology
*
*Postal address: Kyiv National Taras Shevchenko University, 4E Glushkov Ave, 03127, Kyiv, Ukraine. Email address: vicknopova@gmail.com
**Postal address: Faculty of Pure and Applied Mathematics, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland. Email address: zbigniew.palmowski@pwr.edu.pl
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Abstract

Let $X_t^\sharp$ be a multivariate process of the form $X_t =Y_t - Z_t$, $X_0=x$, killed at some terminal time T, where $Y_t$ is a Markov process having only jumps of length smaller than $\delta$, and $Z_t$ is a compound Poisson process with jumps of length bigger than $\delta$, for some fixed $\delta>0$. Under the assumptions that the summands in $Z_t$ are subexponential, we investigate the asymptotic behaviour of the potential function $u(x)= \mathbb{E}^x \int_0^\infty \ell\big(X_s^\sharp\big)ds$. The case of heavy-tailed entries in $Z_t$ corresponds to the case of ‘big claims’ in insurance models and is of practical interest. The main approach is based on the fact that u(x) satisfies a certain renewal equation.

Keywords

Potentialrenewal equationsubexponential distributionapplicationsLévy processes

MSC classification

Primary: 60K20: Applications of Markov renewal processes (reliability, queueing networks, etc.)
Secondary: 60K05: Renewal theory 91B30: Risk theory, insurance

Information

Type
Original Article
Information
Advances in Applied Probability , Volume 54 , Issue 3 , September 2022 , pp. 783 - 807
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Applied Probability Trust

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