L2-singular dichotomy for orbital measures of classical simple Lie algebras

Sanjiv Kumar Gupta, Kathryn E. Hare, Sobhan Seyfaddini

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13 Citations (SciVal)


We prove that the G-invariant orbital measures supported on adjoint orbits in the Lie algebra of a classical, compact, connected, simple Lie group satisfy a smoothness dichotomy: Either μk is singular to Lebesgue measure or μk ∈ L2. The minimum k for which μk ∈ L2 is specified and is also the minimum k such that the k-fold sum of the orbit has positive measure.

Original languageEnglish
Pages (from-to)91-124
Number of pages34
JournalMathematische Zeitschrift
Issue number1
Publication statusPublished - 2009


  • Adjoint orbit
  • Classical Lie algebra
  • Compact Lie group
  • Conjugacy class
  • Orbital measure

ASJC Scopus subject areas

  • Mathematics(all)


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