Gravity coupled with matter and the foundation of non-commutative geometry

  title={Gravity coupled with matter and the foundation of non-commutative geometry},
  author={Alain Connes},
  journal={Communications in Mathematical Physics},
  • A. Connes
  • Published 8 March 1996
  • Mathematics
  • Communications in Mathematical Physics
We first exhibit in the commutative case the simple algebraic relations between the algebra of functions on a manifold and its infinitesimal length elementds. Its unitary representations correspond to Riemannian metrics and Spin structure whileds is the Dirac propagatords=x−x=D−1, whereD is the Dirac operator. We extend these simple relations to the non-commutative case using Tomita's involutionJ. We then write a spectral action, the trace of a function of the length element, which when applied… 

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