An analog of the Deligne–Lusztig duality for (g,K)-modules

Dennis Gaitsgory, Alexander Yom Din

Research output: Contribution to journalArticlepeer-review


Drinfeld suggested the definition of a certain endo-functor, called the pseudo-identity functor, on the category of D-modules on an algebraic stack. We extend this definition to an arbitrary DG category, and show that if certain finiteness conditions are satisfied, this functor is the inverse of the Serre functor. We apply this to the category of (g,K)-modules, and we stipulate that the pseudo-identity functor is the analog of the Deligne–Lusztig functor. In order to support this, we show that the pseudo-identity functor for (g,K)-modules is isomorphic to the composition of cohomological and contragredient dualities, which is parallel to the corresponding assertion for p-adic groups in [4].

Original languageAmerican English
Pages (from-to)212-265
Number of pages54
JournalAdvances in Mathematics
StatePublished - 31 Jul 2018


  • (g,K)-modules
  • D-modules
  • Duality

All Science Journal Classification (ASJC) codes

  • General Mathematics


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