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arXiv 2008.05547math.AT
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周期性$1$的$\mathbb{R}$ -基序$v_{1}-$自映射

An $\mathbb{R}$-motivic $v_{1}-$self-map of periodicity $1$

Prasit Bhattacharya, Bertrand Guillou, Ang Li

摘要:

我们考虑$\mathrm{C}_2$在$1$型谱$\mathcal{Y} := \mathrm{M}_2(1) \wedge \mathrm{C}(η)$上的一个非平凡作用,该谱因其允许$1$ -周期$v_1-$自映射而闻名。所得到的有限$\mathrm{C}_2$ -等变谱$\mathcal{Y}^{\mathrm{C}_2}$也可以看作是有限$\mathbb{R}$ -动机谱$\mathcal{Y}^\mathbb{R}$的复点.本文证明了$\mathcal{Y}$的一个$1$ -周期$v_1-$自映射可以提升为$\mathcal{Y}^{\mathrm{C}_2}$和$\mathcal{Y}^{\mathbb{R}}$的自映射.进一步地,$\mathcal{Y}^{\mathbb{R}}$的自映射的上纤维是$\mathbb{R}$ -motivic Steenrod代数的子代数$\mathcal{A}^\mathbb{R}(1)$的实现。我们还证明了$\mathrm{C}_2$ -等变自映射在$\mathcal{Y}^{\mathrm{C}_2}$的几何不动点上是幂零的.

英文摘要:

We consider a nontrivial action of $\mathrm{C}_2$ on the type $1$ spectrum $\mathcal{Y} := \mathrm{M}_2(1) \wedge \mathrm{C}(η)$, which is well-known for admitting a $1$-periodic $v_1-$self-map. The resultant finite $\mathrm{C}_2$-equivariant spectrum $\mathcal{Y}^{\mathrm{C}_2}$ can also be viewed as the complex points of a finite $\mathbb{R}$-motivic spectrum $\mathcal{Y}^\mathbb{R}$. In this paper, we show that one of the $1$-periodic $v_1-$self-maps of $\mathcal{Y}$ can be lifted to a self-map of $\mathcal{Y}^{\mathrm{C}_2}$ as well as $\mathcal{Y}^{\mathbb{R}}$. Further, the cofiber of the self-map of $\mathcal{Y}^{\mathbb{R}}$ is a realization of the subalgebra $\mathcal{A}^\mathbb{R}(1)$ of the $\mathbb{R}$-motivic Steenrod algebra. We also show that the $\mathrm{C}_2$-equivariant self-map is nilpotent on the geometric fixed-points of $\mathcal{Y}^{\mathrm{C}_2}$.

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