Lo, CH;
Menshikov, MV;
Wade, AR;
(2023)
Strong transience for one-dimensional Markov chains with asymptotically zero drifts.
Stochastic Processes and their Applications
, Article 104260. 10.1016/j.spa.2023.104260.
(In press).
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Abstract
For near-critical, transient Markov chains on the non-negative integers in the Lamperti regime, where the mean drift at x decays as 1/x as x→∞, we quantify degree of transience via existence of moments for conditional return times and for last exit times, assuming increments are uniformly bounded. Our proof uses a Doob h-transform, for the transient process conditioned to return, and we show that the conditioned process is also of Lamperti type with appropriately transformed parameters. To do so, we obtain an asymptotic expansion for the ratio of two return probabilities, evaluated at two nearby starting points; a consequence of this is that the return probability for the transient Lamperti process is a regularly-varying function of the starting point.
Type: | Article |
---|---|
Title: | Strong transience for one-dimensional Markov chains with asymptotically zero drifts |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1016/j.spa.2023.104260 |
Publisher version: | https://doi.org/10.1016/j.spa.2023.104260 |
Language: | English |
Additional information: | © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Transience, Lamperti problem, Last exit times, Conditional return times, Doob transform, Return probabilities |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Statistical Science |
URI: | https://discovery.ucl.ac.uk/id/eprint/10183659 |
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