Publication Date:
11 July 2013
Journal:
Journal of High Energy Physics
Last Updated:
2020-05-15T14:02:05.947+01:00
Issue:
7
Volume:
2013
DOI:
10.1007/jhep07(2013)075
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