Causality Constraints on Corrections to the Graviton Three-Point Coupling

Understand

We consider higher derivative corrections to the graviton three-point coupling within a weakly coupled theory of gravity.

• Lorentz invariance allows further structures beyond the one present in the Einstein theory.
• We argue that these are constrained by causality.
• We devise a thought experiment involving a high energy scattering process which leads to causality violation if the graviton three-point vertex contains the additional structures.