A NOTE ON SPECTRAL PROPERTIES OF RANDOM S-ADIC SYSTEMS

The paper is concerned with random S-adic systems arising from an i.i.d. sequence of unimodular substitutions. Using equidistribution results of Benoist and Quint, we show in Theorem 3.3 that, under some natural assumptions, if the Lyapunov exponent of the spectral cocycle is strictly less than 1/2 of the Lyapunov exponent of the random walk on SL(2,R) driven by the sequence of substitution matrices, then almost surely the spectrum of the S-adic Z-action is singular with respect to any (fixed in advance) continuous measure. Finally, the appendix discusses the weak-mixing property for random S-adic systems as¬sociated to the family of substitutions introduced in Example 4.1.