Gravity Amplitudes as Generalized Double Copies of Gauge-Theory Amplitudes
Gravity Amplitudes as Generalized Double Copies of Gauge-Theory Amplitudes
Whenever the integrand of a gauge-theory loop amplitude can be arranged into a form where the BCJ duality between color and kinematics is manifest, a corresponding gravity integrand can be obtained simply via the double-copy procedure. However, finding such gauge-theory representations can be challenging, especially at high loop orders. Here …