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JOURNALS // Sibirskie Èlektronnye Matematicheskie Izvestiya [Siberian Electronic Mathematical Reports] // Archive

Sib. Èlektron. Mat. Izv., 2023 Volume 20, Issue 1, Pages 86–99 (Mi semr1572)

Probability theory and mathematical statistics

On first-passage times for symmetric random walks without Lindeberg condition

A. I. Sakhanenko

Sobolev Institute of Mathematics, pr. Koptyuga, 4, 630090, Novosibirsk, Russia

Abstract: We consider exit times for random walks with independent but not necessarily identically distributed increments. We are going to describe an asymptotic behavior of the probability that the random walk stays above the moving boundary for a long time. In the paper by D. Denisov, A. Sakhanenko, and V. Wachtel (Ann. Probab., 2018) an universal asymptotic formula for such probability was found in the case when the random walk satisfies the classical Lindeberg condition. Now we investigate a question if it is possible to find similar asymptotics for more general random walks when increments may have infinite variances, but the central limit theorem is still valid. We obtain such result for a class of walks with symmetrically distributed increments.

Keywords: random walk, symmetric distribution, exit time, central limit theorem, moving boundary.

UDC: 519.214

MSC: 60G50;60G40

Received November 22, 2022, published February 12, 2023

DOI: 10.33048/semi.2023.20.008



© Steklov Math. Inst. of RAS, 2025