The Yangian of sl(n|m) and the universal R-matrix

Details The Yangian of sl(n|m) and the universal R-matrix The Yangian of sl(n|m) and the universal R-matrix

2010-08-04

arxiv.org/abs/1008.0872v1

JHEP 1105:012,2011

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, 2 figures

Scientific paper

10.1007/JHEP05(2011)012

In this paper we study Yangians of sl(n|m) superalgebras. We derive the universal R-matrix and evaluate it on the fundamental representation obtaining the standard Yang R-matrix with unitary dressing factors. For m=0, we directly recover up to a CDD factor the well-known S-matrices for relativistic integrable models with su(N) symmetry. Hence, the universal R-matrix found provides an abstract plug-in formula, which leads to results obeying fundamental physical constraints: crossing symmetry, unitrarity and the Yang-Baxter equation. This implies that the Yangian double unifies all desired symmetries into one algebraic structure. In particular, our analysis is valid in the case of sl(n|n), where one has to extend the algebra by an additional generator leading to the algebra gl(n|n). We find two-parameter families of scalar factors in this case and provide a detailed study for gl(1|1).

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