# Chiral Asymmetry and the Spectral Action

#### Autoren: Frank Pfäffle, Christoph Stephan (2013)

We consider orthogonal connections with arbitrary torsion on compact Riemannian manifolds. For the induced Dirac operators, twisted Dirac operators and Dirac operators of Chamseddine-Connes type we compute the spectral action. In addition to the Einstein-Hilbert action and the bosonic part of the Standard Model Lagrangian we find the Holst term from Loop Quantum Gravity, a coupling of the Holst term to the scalar curvature and a prediction for the value of the Barbero-Immirzi parameter.

Zeitschrift:
Comm. Math. Phys.
Verlag:
Springer
Seiten:
283-310
Band:
321, no. 2

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