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gr-qc2018
Spinor-helicity and the algebraic classification of higher-dimensional spacetimes
Ricardo Monteiro, Isobel Nicholson, Donal O'Connell
The spinor-helicity formalism is an essential technique of the amplitudes community. We draw on this method to construct a scheme for classifying higher-dimensional spacetimes in t…
hep-th2018
Two-Loop Scattering Amplitudes from Ambitwistor Strings: from Genus Two to the Nodal Riemann Sphere
Yvonne Geyer, Ricardo Monteiro
We derive from ambitwistor strings new formulae for two-loop scattering amplitudes in supergravity and super-Yang-Mills theory, with any number of particles. We start by constructi…