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Homotopy theory of unital algebras

Brice Le Grignou

Algebraic & Geometric Topology 19 (2019) 1541–1618

We provide an extensive study of the homotopy theory of types of algebras with units, for instance unital associative algebras or unital commutative algebras. To this purpose, we endow the Koszul dual category of curved coalgebras, where the notion of quasi-isomorphism barely makes sense, with a model category structure Quillen equivalent to that of unital algebras. To prove such a result, we use recent methods based on presentable categories. This allows us to describe the homotopy properties of unital algebras in a simpler and richer way. Moreover, we endow the various model categories with several enrichments which induce suitable models for the mapping spaces and describe the formal deformations of morphisms of algebras.

operads, Koszul duality, bar and cobar constructions
Mathematical Subject Classification 2010
Primary: 18D50, 18G30, 18G55, 55U15, 55U40
Received: 25 May 2018
Revised: 25 September 2018
Accepted: 17 October 2018
Published: 21 May 2019
Brice Le Grignou
Mathematical Institute
Utrecht University