Nonlocal charges for bonus yangian symmetries of Super-Yang-Mills
作者： Nathan Berkovits , Andrei Mikhailov
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摘要: The existence of a “bonus” U(1) level-one Yangian symmetry N = 4 super-Yang-Mills has recently been proposed. We provide evidence for this proposal by constructing the BRST-invariant nonlocal charge in pure spinor sigma model corresponding to bonus symmetry. also construct analogous charges symmetries at all odd levels Yangian.
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