Chirality in unified theories of gravity

@article{Nesti2010ChiralityIU,
  title={Chirality in unified theories of gravity},
  author={Fabrizio Nesti and Roberto Percacci},
  journal={Physical Review D},
  year={2010},
  volume={81},
  pages={025010}
}
We show how to obtain a single chiral family of an SO(10) grand unified theory (GUT), starting from a Majorana-Weyl representation of a unifying (GraviGUT) group SO(3,11), which contains the gravitational Lorentz group SO(3,1). An action is proposed, which reduces to the correct fermionic grand unified theory action in the broken phase. 

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