8 papers
Amplitudes and 4D Gauss-Bonnet Theory
James Bonifacio, Kurt Hinterbichler, Laura A. Johnson
It has recently been argued that there may be a nontrivial four-dimensional limit of the higher-dimensional Gauss--Bonnet and Lovelock interactions and that this might provide a lo…
Matter Couplings and Equivalence Principles for Soft Scalars
James Bonifacio, Kurt Hinterbichler, Laura A. Johnson +2
Scalar effective field theories with enhanced soft limits behave in many ways like gauge theories and gravity. In particular, symmetries fix the structure of interactions and the t…
Unitarization from Geometry
James Bonifacio, Kurt Hinterbichler
We study the perturbative unitarity of scattering amplitudes in general dimensional reductions of Yang-Mills theories and general relativity on closed internal manifolds. For the t…
Shift-Symmetric Spin-1 Theories
James Bonifacio, Kurt Hinterbichler, Laura A. Johnson +1
We study interacting massive spin-1 theories in de Sitter (dS) and anti-de Sitter (AdS) space that possess shift symmetries parametrized by (A)dS Killing vectors. We show how they…
Constraints on a Gravitational Higgs Mechanism
James Bonifacio, Kurt Hinterbichler, Rachel A. Rosen
We show that it is impossible to improve the high-energy behavior of the tree-level four-point amplitude of a massive spin-2 particle by including the exchange of any number of sca…
A Universal Bound on the Strong Coupling Scale of a Gravitationally Coupled Massive Spin-2 Particle
James Bonifacio, Kurt Hinterbichler
We find a model-independent upper bound on the strong coupling scale for a massive spin-2 particle coupled to Einstein gravity. Our approach is to directly construct tree-level sca…