Gupta, S. K. and Hare, K. E.:
$L^{2}$-Singular Dichotomy for Orbital Measures on Complex Groups
Bollettino dell'Unione Matematica Italiana Serie 9 3 (2010), fasc. n.3, p. 409-419, (English)
pdf (337 Kb), djvu (108 Kb). | MR 2742774 | Zbl 1217.22008
Sunto
It is known that all continuous orbital measures, $\mu$ on a compact, connected, classical simple Lie group $G$ or its Lie algebra satisfy a dichotomy: either $\mu^{k} \in L^{2}$ or $\mu^{k}$ is purely singular to Haar measure. In this note we prove that the same dichotomy holds for the dual situation, continuous orbital measures on the complex group $G^C$. We also determine the sharp exponent $k$ such that any $k$-fold convolution product of continuous $G$-bi-invariant measures on $G^{C}$ is absolute continuous with respect to Haar measure.
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