Critical Galton-Watson processes: The maximum of total progenies within a large window

Details Critical Galton-Watson processes: The maximum of total progenies within a large window Critical Galton-Watson processes: The maximum of total progenies within a large window

2006-01-13

arxiv.org/abs/math/0601333v1

Mathematics

Probability

28 pages

Scientific paper

Consider a critical Galton-Watson process Z={Z_n: n=0,1,...} of index 1+alpha, alpha in (0,1]. Let S_k(j) denote the sum of the Z_n with n in the window [k,...,k+j), and M_m(j) the maximum of the S_k with k moving in [0,m-j]. We describe the asymptotic behavior of the expectation EM_m(j) if the window width j=j_m is such that j/m converges in [0,1] as m tends to infinity. This will be achieved via establishing the asymptotic behavior of the tail probabilities of M_{infinity}(j).

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