A note on causality constraining higher curvature corrections to gravity

@article{Gruzinov2007ANO,
  title={A note on causality constraining higher curvature corrections to gravity},
  author={Andrei V. Gruzinov and Matthew Kleban},
  journal={Classical and Quantum Gravity},
  year={2007},
  volume={24},
  pages={3521 - 3524}
}
We show that causality constrains the sign of quartic Riemann corrections to the Einstein–Hilbert action. Our constraint constitutes a restriction on candidate theories of quantum gravity. 

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