A "Twistor String" Inspired Formula For Tree-Level Scattering Amplitudes in N=8 SUGRA

Abstract

We propose a new formulation of the complete tree-level S-matrix of N = 8 supergravity. The new formula for n particles in the k R-charge sector is an integral over the Grassmannian G(2,n) and uses the Veronese map into G(k,n). The image of a point in G(2,n) is required to be in the "complement" of a 2|8-plane thus making the SU(8) R-symmetry manifest. The integrand is the ratio of two determinants. The numerator is an analog of Hodges' recent determinant formula for MHV amplitudes. The denominator is a 2(n+k-2) x 2(n+k-2) minor of a 2(n+k) x 2(n+k) matrix of rank 2(n+k-2). Just as Hodges' formula does for MHV amplitudes, our integrand makes the complete invariance under Sn manifest for all sectors. The validity of the new formula follows from two surprising facts. One is the equivalence of Hodges' MHV formula and the Kawai-Lewellen-Tye (KLT) formula when kinematic invariants are allowed to be off-shell in a novel way. We give a proof of this for any number of particles. The second fact is an orthogonality property of the solutions to the polynomial equations defining the Veronese embedding. Explicit proof of the orthogonality is given for all amplitudes in all R-charge sectors with eight or less particles thus providing non-trivial evidence for our proposal.

27 pages

References in corpus (16)

• Direct Proof Of Tree-Level Recursion Relation In Yang-Mills Theory
• New Relations for Gauge-Theory Amplitudes
• What is the Simplest Quantum Field Theory?
• Multi-Leg One-Loop Gravity Amplitudes from Gauge Theory
• Calculating Scattering Amplitudes Efficiently
• Dual Superconformal Invariance, Momentum Twistors and Grassmannians
• On Tree Amplitudes in Gauge Theory and Gravity
• On the Tree-Level S-Matrix of Yang-Mills Theory
• The Grassmannian Origin Of Dual Superconformal Invariance
• Unification of Residues and Grassmannian Dualities
• Gravity, Twistors and the MHV Formalism
• A simple formula for gravitational MHV amplitudes
• An Introduction to On-shell Recursion Relations
• Fundamental BCJ Relation in N=4 SYM From The Connected Formulation
• A Note on MHV Amplitudes for Gravitons
• Descent equations for superamplitudes

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