New expressions for gravitational scattering amplitudes

Author: 

Hodges, A

Journal: 

Journal of High Energy Physics

Publication Date: 

11 July 2013

Last Updated: 

2018-11-29T09:19:06.377+00:00

Issue: 

7

DOI: 

10.1007/JHEP07(2013)075

Volume: 

2013

page: 

n/a-

abstract: 

New methods are introduced for the description and evaluation of tree-level gravitational scattering amplitudes. An N=7 super-symmetric recursion, free from spurious double poles, gives a more efficient method for evaluating MHV amplitudes. The recursion is naturally associated with twistor geometry, and thereby gives a new interpretation for the amplitudes. The recursion leads to new expressions for the MHV amplitudes for six and seven gravitons, simplifying their symmetry properties, and suggesting further generalization. The N=7 recursion is valid for all tree amplitudes, and we illustrate it with a simplified expression for the six-graviton NMHV amplitude. Further new structure emerges when MHV amplitudes are expressed in terms of momentum twistors.

Symplectic id: 

356586

Submitted to ORA: 

Not Submitted

Publication Type: 

Journal Article