paper

Causality Constrains Higher Curvature Corrections to Gravity

arXiv:hep-th/0612015 · doi:10.1088/0264-9381/24/13/N02

Abstract

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.

5 pages

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