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Nonlocal Charges for Bonus Yangian Symmetries of Super-Yang-Mills (1106.2536v1)
Published 13 Jun 2011 in hep-th
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.
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