Hidden algebras in scattering amplitudes

6 November 2012
Dr Ricardo Monteiro
We will discuss the origin of the conjectured colour-kinematics duality in perturbative gauge theory, according to which there is a symmetry between the colour dependence and the kinematic dependence of the S-matrix. Based on this duality, there is a prescription to obtain gravity amplitudes as the "double copy" of gauge theory amplitudes. We will first consider tree-level amplitudes, where a diffeomorphism algebra underlies the structure of MHV amplitudes, mirroring the colour algebra. We will then draw on the progress at tree-level to consider one-loop amplitudes.