On Lacunarity and Sidon-Type Properties for Subsystems of Characters of Compact Abelian Groups

This paper studies subsystems that generalize Rademacher chaos to arbitrary systems of character of compact abelian groups.

The properties of $q$-lacunarity and $\frac{2d}{d+1}$-Sidon are proved for polynomial $d$-chaos constructed from $d$-dissociated subsystems of characters of compact abelian groups.

Subsystems of the polynomial chaos type for unbounded Vilenkin systems are also considered and it is shown that they are not systems of $q$-lacunarity for all $q>2$ and $\alpha$-Sidon for all $\alpha\in [1, 2)$.