Geodesic
Aggregation of states of a branching random walk over multidimensional lattice
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2024), pp. 54-64

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A time-continuous random walk on a multidimensional lattice which underlies the branching random walk with an infinite number of phase states is considered. The random walk with a countable number of states can be reduced to a system with a finite number of states by aggregating them. The asymptotic behavior of the residence time of the transformed system in each of the states depending on the lattice dimension under the assumption of a finite variance and under the condition leading to an infinite variance of jumps of the original system is studied. It is shown that the aggregation of states in the terms of the described process leads to the loss of the Markov property. 
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     author = {G. A. Popov and E. B. Yarovaya},
     title = {Aggregation of states of a branching random walk over multidimensional lattice},
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G. A. Popov; E. B. Yarovaya. Aggregation of states of a branching random walk over multidimensional lattice. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2024), pp. 54-64. http://geodesic.mathdoc.fr/item/VMUMM_2024_1_a6/