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- W4300544265 abstract "We analyse the `quantization commutes with reduction' problem (first studied in physics by Dirac, and known in the mathematical literature also as the Guillemin-Sternberg Conjecture) for the conjugate action of a compact connected Lie group G on its own cotangent bundle T*G. This example is interesting because the momentum map is not proper and the ensuing symplectic (or Marsden-Weinstein quotient) T*G/Ad G is typically singular. In the spirit of (modern) geometric quantization, our quantization of T*G (with its standard Kaehler structure) is defined as the kernel of the Dolbeault-Dirac operator (or, alternatively, the spin Dirac operator) twisted by the pre-quantum line bundle. We show that this quantization of T*G reproduces the Hilbert space found earlier by Hall (2002) using geometric quantization based on a holomorphic polarisation. We then define the quantization of the singular quotient T*G/Ad G$ as the kernel of the (twisted) Dolbeault-Dirac operator on the principal stratum, and show that quantization commutes with reduction in the sense that either way one obtains the same Hilbert space L^2(T)^{W(G,T)}." @default.
- W4300544265 created "2022-10-03" @default.
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- W4300544265 date "2015-08-27" @default.
- W4300544265 modified "2023-09-29" @default.
- W4300544265 title "Quantization commutes with singular reduction: cotangent bundles of compact Lie groups" @default.
- W4300544265 doi "https://doi.org/10.48550/arxiv.1508.06763" @default.
- W4300544265 hasPublicationYear "2015" @default.
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