title: Quanta of geometry: noncommutative aspects.
abstract: In the construction of spectral manifolds in noncommutative geometry, a higher degree Heisenberg commutation relation involving the Dirac operator and the Feynman slash of real scalar fields naturally appears and implies, by equality with the index formula, the quantization of the volume. We first show that this condition implies that the manifold decomposes into disconnected spheres, which will represent quanta of geometry. We then refine the condition by involving the real structure and two types of geometric quanta, and show that connected spin manifolds with large quantized volume are then obtained as solutions. The two algebras M_{2}(H) and M_{4}(C) are obtained, which are the exact constituents of the standard model. Using the two maps from M_{4} to S^{4} the four-manifold is built out of a very large number of the two kinds of spheres of Planckian volume. We give several physical applications of this scheme such as quantization of the cosmological constant, mimetic dark matter, and area quantization of black holes.
authors: Physics Department, American University of Beirut, Lebanon.|I.H.E.S., F-91440 Bures-sur-Yvette, France.
authors: Ali H
authors: AH
authors: Chamseddine
authors: I.H.E.S., F-91440 Bures-sur-Yvette, France.|College de France, 3 rue Ulm, F75005 Paris, France.|Department of Mathematics, The Ohio State University, Columbus, Ohio 43210, USA.
authors: Alain
authors: A
authors: Connes
authors: Theoretical Physics, Ludwig Maxmillians University, Theresienstraße 37, 80333 Munich, Germany.|MPI for Physics, Foehringer Ring, 6, 80850 Munich, Germany.
authors: Viatcheslav
authors: V
authors: Mukhanov