Chiral Fermions and Spinc structures on Matrix approximations to manifolds

Abstract

The Atiyah-Singer index theorem is investigated on various compact manifolds which admit finite matrix approximations (``fuzzy spaces'') with a view to applications in a modified Kaluza-Klein type approach in which the internal space consists of a finite number of points. Motivated by the chiral nature of the standard model spectrum we investigate manifolds that do not admit spinors but do admit $Spi{n}^c$ structures. It is shown that, by twisting with appropriate bundles, one generation of the electroweak sector of the standard model, including a right-handed neutrino, can be obtained in this way from the complex projective space $\CP^2$. The unitary Grassmannian $U(5)/(U(3)\times U(2))$ yields a spectrum that contains the correct charges for the Fermions of the standard model, with varying multiplicities for the different particle states.

arXiv comment22 pages, no figures

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• The Spectrum of the Dirac Operator on Coset Spaces with Homogeneous Gauge Fields
• Scalar Field Theory on Fuzzy S^4
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• Noncommutative vector bundles over fuzzy CP^N and their covariant derivatives
• Dimensional Reduction, Monopoles and Dynamical Symmetry Breaking
• Dimensional Reduction and Vacuum Structure of Quiver Gauge Theory
• The Standard Model Fermion Spectrum From Complex Projective spaces
• A projective Dirac operator on CP^2 within fuzzy geometry