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  • Continuous-state branching processes with collisions: first passage times and duality
    Foucart, Clément ; Vidmar, Matija, 1988-
    We introduce a class of one-dimensional positive Markov processes generalizing continuous-state branching processes (CBs), by taking into account a phenomenon of random collisions. Besides branching, ... characterized by a general mechanism ▫$\Psi$▫, at a constant rate in time two particles are sampled uniformly in the population, collide and leave a mass of particles governed by a (sub)critical mechanism ▫$\Sigma$▫. Such CB processes with collisions (CBCs) are shown to be the only Feller processes without negative jumps satisfying a Laplace duality relationship with one-dimensional diffusions on the half-line. This generalizes the duality observed for logistic CBs by Foucart (2019). Via time-change, CBCs are also related to an auxiliary class of Markov processes, called CB processes with spectrally positive migration (CBMs), recently introduced by Vidmar (2022). We find necessary and sufficient conditions for the boundaries ▫$0$▫ or ▫$\infty$▫ to be attracting and for a limiting distribution to exist. The Laplace transform of the latter is provided. Under the assumption that the CBC process does not explode, the Laplace transforms of the first passage times below arbitrary levels are represented with the help of the solution of a secondorder differential equation, whose coefficients express in terms of the Lévy–Khintchine functions ▫$\Sigma$▫ and ▫$\Psi$▫. Sufficient conditions for non-explosion are given.
    Source: Stochastic Processes and their Applications. - ISSN 0304-4149 (Vol. 167, [article no.] 104230, Jan. 2024, 35 str.)
    Type of material - article, component part ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 170650115

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S0304414923002028
    Repository of the University of Ljubljana – RUL
    DOI

source: Stochastic Processes and their Applications. - ISSN 0304-4149 (Vol. 167, [article no.] 104230, Jan. 2024, 35 str.)
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