The Functional Equation of the Smoothing Transform

Details The Functional Equation of the Smoothing Transform The Functional Equation of the Smoothing Transform

2009-06-17

arxiv.org/abs/0906.3133v2

Mathematics

Probability

33 pages

Scientific paper

Given a sequence $T = (T_i)_{i \geq 1}$ of non-negative random variables, a function $f$ on the positive halfline can be transformed to $\E \prod_{i\geq 1} f(tT_i)$. We study the fixed points of this transform within the class of decreasing functions. By exploiting the intimate relationship with general branching processes, a full description of the set of solutions is established without the moment conditions that figure in earlier studies. Since the class of functions under consideration contains all Laplace transforms of probability distributions on $[0,\infty)$, the results provide the full description of the set of solutions to the fixed-point equation of the smoothing transform, $X\stackrel{d}{=}\sum_{i\geq 1} T_i X_i$, where $\stackrel{d}{=}$ denotes equality of the corresponding laws and $X_1, X_2, ...$ is a sequence of i.i.d.\ copies of $X$ independent of $T$. Moreover, since left-continuous survival functions are covered as well, the results also apply to the fixed-point equation $X\stackrel{d}{=}\inf\{X_i/T_i: i \geq 1, T_i > 0\}$.

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