Soft factors and interaction vertices from light-cone actions

Abstract

Universal factors associated with the emission of a soft boson in gauge theories and gravity, formulated in the light-cone gauge, are presented. The inverse-soft method, for constructing higher-point amplitudes from lower-point ones, using these factors is reviewed. These ideas are then examined in (light-cone) superspace and applied to both the N=4 super Yang-Mills and N=8 supergravity theories. One highlight is a compact result for the quartic interaction vertex in N=8 supergravity, a crucial ingredient for finiteness analyses.

18 pages, 2 figures

References in corpus (8)

• Three-Loop Superfiniteness of N=8 Supergravity
• Ultraviolet Properties of N = 8 Supergravity at Five Loops
• KLT relations from the Einstein-Hilbert Lagrangian
• Off-Shell Spinor-Helicity Amplitudes from Light-Cone Deformation Procedure
• Generating All Tree Amplitudes in N=4 SYM by Inverse Soft Limit
• The N=8 Supergravity Hamiltonian as a Quadratic Form
• Soft theorems in maximally supersymmetric theories
• Factorization of cubic vertices involving three different higher spin fields