# 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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