Index Theory for Locally Compact Noncommutative Geometries

Released on by A. L. Carey
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  • Index Theory for Locally Compact Noncommutative Geometries Book Detail

  • Author : A. L. Carey
  • Release Date : 2014-08-12
  • Publisher : American Mathematical Soc.
  • Genre : Mathematics
  • Pages : 142
  • ISBN 13 : 0821898388
  • File Size : 88,88 MB
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Index Theory for Locally Compact Noncommutative Geometries by A. L. Carey PDF Summary

Book Description: Spectral triples for nonunital algebras model locally compact spaces in noncommutative geometry. In the present text, the authors prove the local index formula for spectral triples over nonunital algebras, without the assumption of local units in our algebra. This formula has been successfully used to calculate index pairings in numerous noncommutative examples. The absence of any other effective method of investigating index problems in geometries that are genuinely noncommutative, particularly in the nonunital situation, was a primary motivation for this study and the authors illustrate this point with two examples in the text. In order to understand what is new in their approach in the commutative setting the authors prove an analogue of the Gromov-Lawson relative index formula (for Dirac type operators) for even dimensional manifolds with bounded geometry, without invoking compact supports. For odd dimensional manifolds their index formula appears to be completely new.

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