Based on the observation that, for massless particles of spin-one or more, scattering amplitudes are much simpler than expected from traditional Feynman diagram techniques, this book aims broadly to understand and exploit this heretofore hidden structure.

Based on the observation that, for massless particles of spin-one or more, scattering amplitudes are much simpler than expected from traditional Feynman diagram techniques, this book aims broadly to understand and exploit this heretofore hidden structure.

Based on the observation that, for massless particles of spin-one or more, scattering amplitudes are much simpler than expected from traditional Feynman diagram techniques, this book aims broadly to understand and exploit this heretofore hidden structure.