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In this lecture, I will introduce massive spinor helicity formalism developed in 1709.04891, and explore the electromagnetic/gravitational interactions of high spin particles. We will define, kinematically, minimal coupling for particles of arbitrary spin. While there are no known elementary particles beyond spin-2, we will demonstrate that these minimal coupling the multiple spin-moments of...
Recent years have revealed a variety of mathematical and physical structures underlying scattering amplitudes, with redefinitions of scattering amplitudes where the usual principles of locality and unitarity are derivative from geometry. The amplituhedron is one of the examples, a purely geometric object which gives scattering amplitudes of planar N=4 SYM. All tree-level amplitudes and...
