Super-Schwarzians via nonlinear realizations
arXiv:2004.04489 · doi:10.1007/JHEP06(2020)027
Abstract
The N=1 and N=2 super-Schwarzian derivatives were originally introduced by physicists when computing a finite superconformal transformation of the super stress-energy tensor underlying a superconformal field theory. Mathematicians like to think of them as the cocycles describing central extensions of Lie superalgebras. In this work, a third possibility is discussed which consists in applying the method of nonlinear realizations to osp(1|2) and su(1,1|1) superconformal algebras. It is demonstrated that the super-Schwarzians arise quite naturally, if one decides to keep the number of independent Goldstone superfields to a minimum.
V2: 14 pages; presentation improved in the introductory and concluding sections, two refs. added; the version to appear in JHEP
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