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arXiv 1906.07481math.RT
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对称群的旋量表示

Spinorial Representations of Symmetric Groups

Jyotirmoy Ganguly, Steven Spallone

摘要:

有限群的实表示$π$可以被认为是正交群$\Or(V)$的同态。对于对称群$S_n$、交错群$A_n$和对称群的乘积$S_n \times S_{n'}$,给出了$π$是否提升到$\Or(V)$的双覆盖$\Pin(V)$的标准.从这些标准,我们计算这些表示的第二Stiefel-Whitney类。

英文摘要:

A real representation $π$ of a finite group may be regarded as a homomorphism to an orthogonal group $\Or(V)$. For symmetric groups $S_n$, alternating groups $A_n$, and products $S_n \times S_{n'}$ of symmetric groups, we give criteria for whether $π$ lifts to the double cover $\Pin(V)$ of $\Or(V)$, in terms of character values. From these criteria, we compute the second Stiefel-Whitney classes of these representations.

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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