Beilinson–Bernstein localization theorem

E876104

The Beilinson–Bernstein localization theorem is a fundamental result in geometric representation theory that realizes representations of semisimple Lie algebras as sheaves of differential operators on flag varieties, establishing an equivalence between algebraic and geometric categories.

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Predicate Object
instanceOf mathematical theorem
result in geometric representation theory
appliesTo complex semisimple Lie algebras
asserts global section functor is quasi-inverse for regular dominant central character
localization functor is an equivalence for regular dominant central character
concerns D-modules
linked to: theory of D-modules

category O
flag varieties
highest weight representations
semisimple Lie algebras
sheaves of differential operators
context Borel subalgebra
Cartan subalgebra
linked to: Cartan subalgebras

Weyl group
root system
describes global section functor from D-modules to modules
localization functor from modules to D-modules
establishes equivalence of categories
field algebraic geometry
geometric representation theory
representation theory
generalizedBy localization for singular characters
hasVersionFor real groups (via related localization techniques)
influenced Kazhdan–Lusztig theory
geometric Langlands program
linked to: Langlands program

study of category O via geometry
theory of perverse sheaves
keyConcept block decomposition by central character
equivariant D-modules
highest weight category
twisted sheaves of differential operators
namedAfter Alexander Beilinson
Joseph Bernstein
originallyFormulatedFor complex algebraic groups
provides geometric construction of irreducible highest weight modules
geometric realization of category O
publishedIn early 1980s
relatedTo Borel–Weil–Bott theorem
Riemann–Hilbert correspondence (conceptually)
relates coherent D-modules on flag varieties
representations of semisimple Lie algebras
requires regular dominant infinitesimal character
uses Harish-Chandra isomorphism
algebraic D-modules
center of the universal enveloping algebra
flag variety of a semisimple algebraic group
universal enveloping algebra
yearProved late 1970s

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Alexander Beilinson knownFor Beilinson–Bernstein localization theorem
Alexander Beilinson notableWork Beilinson–Bernstein localization for representations of semisimple Lie algebras
linked to: Beilinson–Bernstein localization theorem