arXiv 1710.053662017-10math.ATmath.AGmath.RT

Multiplicative Structure in the Stable Splitting of $ΩSL_n(\mathbb{C})$

Jeremy Hahn, Allen Yuan

备注：: 32 pages. Comments welcome!
发表信息：: Advances in Mathematics 348 (2019) 412-455
DOI：: 10.1016/j.aim.2019.03.022

英文摘要：

The space of based loops in $SL_n(\mathbb{C})$, also known as the affine Grassmannian of $SL_n(\mathbb{C})$, admits an $\mathbb{E}_2$ or fusion product. Work of Mitchell and Richter proves that this based loop space stably splits as an infinite wedge sum. We prove that the Mitchell--Richter splitting is coherently multiplicative, but not $\mathbb{E}_2$. Nonetheless, we show that the splitting becomes $\mathbb{E}_2$ after base-change to complex cobordism. Our proof of the $\mathbb{A}_\infty$ splitting involves on the one hand an analysis of the multiplicative properties of Weiss calculus, and on the other a use of Beilinson--Drinfeld Grassmannians to verify a conjecture of Mahowald and Richter. Other results are obtained by explicit, obstruction-theoretic computations.

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