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## Regular behavior at infinity of stationary measures of stochastic recursion on NA groups

### Tom 118 / 2010

Colloquium Mathematicum 118 (2010), 499-523 MSC: Primary 60B15; Secondary 60J50, 22E25. DOI: 10.4064/cm118-2-8

#### Streszczenie

Let $N$ be a simply connected nilpotent Lie group and let $S=N\rtimes (\mathbb R ^+)^d$ be a semidirect product, $(\mathbb R ^+)^d$ acting on $N$ by diagonal automorphisms. Let $(Q_n, M_n)$ be a sequence of i.i.d. random variables with values in $S$. Under natural conditions, including contractivity in the mean, there is a unique stationary measure $\nu$ on $N$ for the Markov process $X_n=M_nX_{n-1}+Q_n$. We prove that for an appropriate homogeneous norm on $N$ there is $\chi _0$ such that $$\lim _{t\to \infty}t^{\chi _0} \nu \{ x: |x| >t\}=C>0.$$ In particular, this applies to classical Poisson kernels on symmetric spaces, bounded homogeneous domains in $\mathbb C ^n$ or homogeneous manifolds of negative curvature.

#### Autorzy

• Dariusz BuraczewskiInstitute of Mathematics
University of Wrocław
Pl. Grunwaldzki 2/4
50-384 Wrocław, Poland
e-mail
• Ewa DamekInstitute of Mathematics
University of Wrocław
Pl. Grunwaldzki 2/4
50-384 Wroclaw, Poland
e-mail

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