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On Moments of Multiplicative Coalescents

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arxiv 2108.11799 v2 pith:UKBEEQEP submitted 2021-08-26 math.PR

classification math.PR
keywords multiplicativecoalescentmomentspartanalysisbyproductscoalescentseternal
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abstract

We prove existence of all moments of the multiplicative coalescent at all times. We obtain as byproducts a number of related results which could be of general interest. In particular, we show the finiteness of the second moment of the $l^2$ norm for any extremal eternal version of multiplicative coalescent. Our techniques are in part inspired by percolation, and in part are based on tools from stochastic analysis, notably the semi-martingale and the excursion theory.

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