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Formality of the Little $N$-disks Operad PDF
by Pascal Lambrechts
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The little $N$-disks operad, $\mathcal B$, along with its variants, is an important tool in homotopy theory.
It is defined in terms of configurations of disjoint $N$-dimensional disks inside the standard unit disk in $\mathbb{R}^N$ and it was initially conceived for detecting and understanding $N$-fold loop spaces.
Its many uses now stretch across a variety of disciplines including topology, algebra, and mathematical physics.
In this paper, the authors develop the details of Kontsevich's proof of the formality of little $N$-disks operad over the field of real numbers.
More precisely, one can consider the singular chains $\operatorname{C}_*(\mathcal B; \mathbb{R})$ on $\mathcal B$ as well as the singular homology $\operatorname{H}_*(\mathcal B; \mathbb{R})$ of $\mathcal B$.
These two objects are operads in the category of chain complexes.
The formality then states that there is a zig-zag of quasi-isomorphisms connecting these two operads.
The formality also in some sense holds in the category of commutative differential graded algebras.
The authors additionally prove a relative version of the formality for the inclusion of the little $m$-disks operad in the little $N$-disks operad when $N\geq2m+1$.
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- Format:PDF
- Pages:116 pages
- Publisher:American Mathematical Society
- Publication Date:01/01/1900
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- ISBN:9781470416690
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Information
-
Download Now
- Format:PDF
- Pages:116 pages
- Publisher:American Mathematical Society
- Publication Date:01/01/1900
- Category:
- ISBN:9781470416690