Nonlocal Charges for Bonus Yangian Symmetries of Super-Yang-Mills
arXiv:1106.2536 · doi:10.1007/JHEP07(2011)125
Abstract
The existence of a "bonus" U(1) level-one Yangian symmetry of N=4 super-Yang-Mills has recently been proposed. We provide evidence for this proposal by constructing the BRST-invariant nonlocal charge in the pure spinor sigma model corresponding to this bonus level-one symmetry. We also construct analogous charges for bonus U(1) symmetries at all odd levels of the Yangian.
LaTeX 16pp