-Singular Dichotomy for Orbital Measures on Complex Groups
It is known that all continuous orbital measures, on a compact, connected, classical simple Lie group or its Lie algebra satisfy a dichotomy: either or 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 . We also determine the sharp exponent such that any -fold convolution product of continuous -bi-invariant measures on is absolute continuous with respect to Haar measure.