Tree-level unitarity in Higgs inflation in the metric and the Palatini formulation

Understand

We calculate the tree-level amplitudes for electrically neutral $2\to2$ scattering for the Standard Model Higgs doublet non-minimally coupled to the Ricci scalar.

• We consider both the metric and the Palatini formulation of gravity.
• We find the partial wave unitarity limit for a general background field value.
• Our results are in agreement with previous work.