摘要
Let g be a(twisted or untwisted)affine Kac-Moody algebra,and μ be a diagram automorphism of g.In this paper,we give an explicit realization for the universal central extensionˆg[μ]of the twisted loop algebra of g with respect toμ,which provides a Moody-Rao-Yokonuma presentation for the algebraˆg[μ]whenμis non-transitive,and the presentation is indeed related to the quantization of twisted toroidal Lie algebras.
基金
supported by National Natural Science Foundation of China(Grant Nos.11531004 and 11701183)
the Fundamental Research Funds for the Central Universities(Grant No.20720190069)
the Simons Foundation(Grant No.198129)。
