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arXiv math-ph/0002016math-phmath.MP
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单同态的扩张与流代数

Extensions of diffeomorphism and current algebras

T. A. Larsson

摘要:

Dzhumadil'daev对$diff(N)$的所有张量模扩张进行了分类,$diff(N)$是$N$维的单同态代数,它的无散度、哈密顿和切触向量场的子代数。我用显式张量表示法回顾了他的结果。他所有的一般上循环都是平凡上循环的极限,许多都是从$gl(N)$的米克尔森-法捷耶夫代数中产生的。然后将他的结果推广到一些非张量模,包括Eswara Rao/Moody和我发现的高维维拉索罗代数.通过对$diff(N+d)$的限制,得到了具有$d$ -维表示的流代数的扩张.这给出了高维Virasoro和Kac-Moody上循环之间的联系,以及Mickelsson-Faddeev上循环与流代数之间的联系。

英文摘要:

Dzhumadil'daev has classified all tensor module extensions of $diff(N)$, the diffeomorphism algebra in $N$ dimensions, and its subalgebras of divergence free, Hamiltonian, and contact vector fields. I review his results using explicit tensor notation. All of his generic cocycles are limits of trivial cocycles, and many arise from the Mickelsson-Faddeev algebra for $gl(N)$. Then his results are extended to some non-tensor modules, including the higher-dimensional Virasoro algebras found by Eswara Rao/Moody and myself. Extensions of current algebras with $d$-dimensional representations are obtained by restriction from $diff(N+d)$. This gives a connection between higher-dimensional Virasoro and Kac-Moody cocycles, and between Mickelsson-Faddeev cocycles for diffeomorphism and current algebras.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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