TY - JOUR

T1 - An analog of the Deligne–Lusztig duality for (g,K)-modules

AU - Gaitsgory, Dennis

AU - Yom Din, Alexander

N1 - Publisher Copyright:
© 2018 Elsevier Inc.

PY - 2018/7/31

Y1 - 2018/7/31

N2 - 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].

AB - 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].

KW - (g,K)-modules

KW - D-modules

KW - Duality

UR - http://www.scopus.com/inward/record.url?scp=85047732247&partnerID=8YFLogxK

U2 - 10.1016/j.aim.2018.05.030

DO - 10.1016/j.aim.2018.05.030

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AN - SCOPUS:85047732247

SN - 0001-8708

VL - 333

SP - 212

EP - 265

JO - Advances in Mathematics

JF - Advances in Mathematics

ER -