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arXiv 2108.11432math.QA
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关于Hopf 2-上循环的计算,并以对角型为例

On the computation of Hopf 2-cocycles, with an example of diagonal type

Agustín García Iglesias, José Ignacio Sánchez

摘要:

给出了半单霍普夫代数上Nichols代数变形中所涉及的霍普夫2-上圈的计算框架。我们写下来的递归公式,并调查的程度与不变的Hochschild上同调的指数。作为一个例子,我们提出了详细的计算,导致显式描述的Hopf 2-上循环涉及的Cartan型$A_2$与$q=-1$,a.k.a.的尼科尔斯代数的变形。小量子群$\mathfrak{u}^+_{\sqrt{\text{-1}}}(\mathfrak{sl}_3)$的正部分。我们证明了这些上圈是一般纯的,也就是说它们与Hochschild 2-上圈的指数不上同调。

英文摘要:

We present a framework for the computation of the Hopf 2-cocycles involved in the deformations of Nichols algebras over semisimple Hopf algebras. We write down a recurrence formula and investigate the extent of the connection with invariant Hochschild cohomology in terms of exponentials. As an example, we present detailed computations leading to the explicit description of the Hopf 2-cocycles involved in the deformations of a Nichols algebra of Cartan type $A_2$ with $q=-1$, a.k.a. the positive part of the small quantum group $\mathfrak{u}^+_{\sqrt{\text{-1}}}(\mathfrak{sl}_3)$. We show that these cocycles are generically pure, that is they are not cohomologous to exponentials of Hochschild 2-cocycles.

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