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Exposing relative endoscopy in unitary symmetric spaces

Research in the Mathematical Sciences20152:9

  • Received: 22 December 2014
  • Accepted: 8 March 2015
  • Published:


We introduce a new class of symmetric space orbital integrals important for applications in certain relative trace formula appearing in the theory of automorphic representations. We verify a fundamental lemma for U2×U2U4 via an explicit calculation, giving the first known example of endoscopy for symmetric spaces and showing strong evidence that there is a general theory of endoscopy lurking in this situation.

AMS subject classification Primary 20G05


  • Endoscopy
  • Orbital integral
  • Unitary group
  • Trace formula
  • Representation theory