High Energy Physics - Theory
[Submitted on 29 Dec 2008 (v1), last revised 21 Apr 2009 (this version, v3)]
Title:Three Applications of a Bonus Relation for Gravity Amplitudes
View PDFAbstract: Arkani-Hamed et. al. have recently shown that all tree-level scattering amplitudes in maximal supergravity exhibit exceptionally soft behavior when two supermomenta are taken to infinity in a particular complex direction, and that this behavior implies new non-trivial relations amongst amplitudes in addition to the well-known on-shell recursion relations. We consider the application of these new bonus relations to MHV amplitudes, showing that they can be used quite generally to relate (n-2)!-term formulas typically obtained from recursion relations to (n-3)!-term formulas related to the original BGK conjecture. Specifically we provide (1) a direct proof of a formula presented by Elvang and Freedman, (2) a new formula based on one due to Bedford et. al., and (3) an alternate proof of a formula recently obtained by Mason and Skinner. Our results also provide the first direct proof that the conjectured BGK formula, only very recently proven via completely different methods, satisfies the on-shell recursion.
Submission history
From: Marcus Spradlin [view email][v1] Mon, 29 Dec 2008 20:03:37 UTC (13 KB)
[v2] Wed, 11 Mar 2009 00:34:51 UTC (13 KB)
[v3] Tue, 21 Apr 2009 13:12:05 UTC (13 KB)
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