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- W2103805910 abstract "Abstract The Guillemin–Sternberg conjecture states that “quantisation commutes with reduction” in a specific technical setting. So far, this conjecture has almost exclusively been stated and proved for compact Lie groups G acting on compact symplectic manifolds, and, largely due to the use of Spin c Dirac operator techniques, has reached a high degree of perfection under these compactness assumptions. In this paper we formulate an appropriate Guillemin–Sternberg conjecture in the general case, under the main assumptions that the Lie group action is proper and cocompact. This formulation is motivated by our interpretation of the “quantisation commuates with reduction” phenomenon as a special case of the functoriality of quantisation, and uses equivariant K -homology and the K -theory of the group C *-algebra C *(G) in a crucial way. For example, the equivariant index – which in the compact case takes values in the representation ring R ( G ) – is replaced by the analytic assembly map – which takes values in K 0 ( C *( G )) – familiar from the Baum–Connes conjecture in noncommutative geometry. Under the usual freeness assumption on the action, we prove our conjecture for all Lie groups G having a discrete normal subgroup Γ with compact quotient G /Γ, but we believe it is valid for all unimodular Lie groups." @default.
- W2103805910 created "2016-06-24" @default.
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- W2103805910 date "2008-02-11" @default.
- W2103805910 modified "2023-09-25" @default.
- W2103805910 title "The Guillemin–Sternberg conjecture for noncompact groups and spaces" @default.
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- W2103805910 doi "https://doi.org/10.1017/is008001002jkt022" @default.
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