Discovery-HET Seminar: Song He – University of Copenhagen

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Discovery-HET Seminar: Song He

Speaker: Song He (IAS)

Title: S-matrices of massless particles

Abstract: I will present compact formula for the tree-level S-matrix of scalar theory, Yang-Mills and gravity in arbitrary spacetime dimension, in terms of integrals over punctures on a sphere restricted to satisfy a set of equations. The new formula for S-matrices of scalars, gluons and gravitons are closely related to each other, which makes non-trivial properties of the amplitudes, such as KLT relations, BCJ color-kinematics duality and double-copy relations, manifest. The formula also has implications for the S-matrix of string theories in twistor space and in the pure spinor formalism.