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Change of measure in the lookdown particle system

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  • Hénard, Olivier

Abstract

We perform various changes of measure in the lookdown particle system of Donnelly and Kurtz. The first example is a product type h-transform related to conditioning a Generalized Fleming–Viot process without mutation on coexistence of some genetic types in remote time. We give a pathwise construction of this h-transform by just “forgetting” some reproduction events in the lookdown particle system. We also provide an intertwining relationship for the Wright–Fisher diffusion and explicit the associated pathwise decomposition. The second example, called the linear or additive h-transform, concerns a wider class of measure-valued processes with spatial motion. Applications include a simple description of the additiveh-transform of the Generalized Fleming–Viot process and an immortal particle representation for the additive h-transform of the Dawson–Watanabe process.

Suggested Citation

  • Hénard, Olivier, 2013. "Change of measure in the lookdown particle system," Stochastic Processes and their Applications, Elsevier, vol. 123(6), pages 2054-2083.
    • Handle: RePEc:eee:spapps:v:123:y:2013:i:6:p:2054-2083
    DOI: 10.1016/j.spa.2013.01.015
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    References listed on IDEAS

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    1. Berestycki, J. & Kyprianou, A.E. & Murillo-Salas, A., 2011. "The prolific backbone for supercritical superprocesses," Stochastic Processes and their Applications, Elsevier, vol. 121(6), pages 1315-1331, June.
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