Theory HEP Seminar

On-shell Scattering Amplitudes from Massive Supergravity

Laura Johnson

ETH Zurich

Enhancing the symmetry of physical theories to include supersymmetry has a history of leading to important insights, and so we are investigating if supersymmetry has interesting things to teach us about massive gravity. In this talk, we will start by introducing massive spin-2 theories and reviewing some of their key features. Then, using massive spinor helicity variables, we will review an on-shell superspace formalism for massive particles in four dimensions. Finally, we apply this formalism to massive spin-2 amplitudes, deriving all spin-2 cubic vertices that are compatible with supersymmetry and exploring the constraints that adding more supersymmetry has on these massive spin-2 cubic vertices. We conclude by summarizing our progress towards computing the 4-point massive supersymmetric spin-2 amplitudes.