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arXiv 2008.10288math.DG
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Clifford系统、Clifford结构及其正则differential forms

Clifford systems, Clifford structures, and their canonical differential forms

Kai Brynne M. Boydon, Paolo Piccinni

摘要:

四元数$4$ -形式$Φ_{Sp(2)Sp(1)}$和凯莱校准$Φ_{Spin(7)}$的不同结构之间的比较表明,人们可以开始为他们从相同的集合“凯勒2-形式”,进入8维都在四元数凯勒和$Spin(7)$几何。这种比较关系到偶Clifford结构和Clifford系统的概念。对于维度$16$,类似的构造允许为规范$4$ -形式$Φ_{Spin(8)}$和$Φ_{Spin(7)U(1)}$写出显式公式,其与关联于$SO(16)$的子群$Spin(8)$和$Spin(7)U(1)$的Clifford系统相关联。我们的特点校准$4$ -平面的$4$ -形式$Φ_{Spin(8)}$和$Φ_{Spin(7)U(1)}$,扩展在两个不同的方式凯莱$4$ -平面的概念,以尺寸$16$。

英文摘要:

A comparison among different constructions of the quaternionic $4$-form $Φ_{Sp(2)Sp(1)}$ and of the Cayley calibration $Φ_{Spin(7)}$ shows that one can start for them from the same collections of "Kähler 2-forms", entering in dimension 8 both in quaternion Kähler and in $Spin(7)$ geometry. This comparison relates with the notions of even Clifford structure and of Clifford system. Going to dimension $16$, similar constructions allow to write explicit formulas for the canonical $4$-forms $Φ_{Spin(8)}$ and $Φ_{Spin(7)U(1)}$, associated with Clifford systems related with the subgroups $Spin(8)$ and $Spin(7)U(1)$ of $SO(16)$. We characterize the calibrated $4$-planes of the $4$-forms $Φ_{Spin(8)}$ and $Φ_{Spin(7)U(1)}$, extending in two different ways the notion of Cayley $4$-plane to dimension $16$.

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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