# 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}
}
• Published 4 December 2006
• Physics
• Classical and Quantum Gravity
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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