11 research outputs found
Lagrangian Insertion in the Light-Like Limit and the Super-Correlators/Super-Amplitudes Duality
In these notes we describe how to formulate the Lagrangian insertion
technique in a way that mimics generalized unitarity. We introduce a notion of
cuts in real space and show that the cuts of the correlators in the
super-correlators/super-amplitudes duality correspond to generalized unitarity
cuts of the equivalent amplitudes. The cuts consist of correlation functions of
operators in the chiral part of the stress-tensor multiplet as well as other
half-BPS operators. We will also discuss the application of the method to other
correlators as well as non-planar contributions.Comment: 25 pages, 9 figures, added references; some sections have been
expanded, a substantial part have been rearranged; v4 examples added to make
it easier to rea
Gravitino Interactions from Yang-Mills Theory
We fabricate gravitino vertex interactions using as only input on-shell
Yang-Mills amplitudes and the Kawai-Lewellen-Tye gauge theory / gravity
relations. A useful result of this analysis is simpler tree-level Feynman rules
for gravitino scattering than in traditional gauges. All results are explicitly
verified until five point scattering.Comment: 17 pages, 10 figures, REVTe
On correlation functions of Wilson loops, local and non-local operators
We discuss and extend recent conjectures relating partial null limits of
correlation functions of local gauge invariant operators and the expectation
value of null polygonal Wilson loops and local gauge invariant operators. We
point out that a particular partial null limit provides a strategy for the
calculation of the anomalous dimension of short twist-two operators at weak and
strong coupling.Comment: 29 pages, 8 figure
Ambitwistor formulations of R2 gravity and (DF)2 gauge theories
We consider D-dimensional amplitudes in R-2 gravities (conformal gravity in D = 4) and in the recently introduced (DF)(2) gauge theory, from the perspective of the CHY formulae and ambitwistor string theory. These theories are related through the BCJ double-copy construction, and the (DF)(2) gauge theory obeys color-kinematics duality. We work out the worldsheet details of these theories and show that they admit a formulation as integrals on the support of the scattering equations, or alternatively, as ambitwistor string theories. For gravity, this generalizes the work done by Berkovits and Witten on conformal gravity to D dimensions. The ambitwistor is also interpreted as a D-dimensional generalization of Witten's twistor string (SYM + conformal supergravity). As part of our ambitwistor investigation, we discover another (DF)(2) gauge theory containing a photon that couples to Einstein gravity. This theory can provide an alternative KLT description of Einstein gravity compared to the usual Yang-Mills squared