An A-infinity operad in spineless cacti

Imma Gálvez-Carrillo; Leandro Lombardi; Andrew Tonks

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arXiv · 1304.0352

An A-infinity operad in spineless cacti

Imma Gálvez-Carrillo·Leandro Lombardi·Andrew Tonks

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Abstract

The d.g. operad C of cellular chains on the operad of spineless cacti is isomorphic to the Gerstenhaber-Voronov operad codifying the cup product and brace operations on the Hochschild cochains of an associative algebra, and to the suboperad F_2X of the surjection operad. Its homology is the Gerstenhaber operad G. We construct an operad map psi from A-infinity to C such that psi(m_2) is commutative and the homology of psi is the canonical map A \to Com \to G. This formalises the idea that, since the cup product is commutative in homology, its symmetrisation is a homotopy associative operation. Our explicit A-infinty structure does not vanish on non-trivial shuffles in higher degrees, so does not give a map from Com-infinity to C. If such a map could be written down explicitly, it would immediately lead to a G-infinity structure on C and on Hochschild cochains, that is, to a direct proof of the Deligne conjecture.

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BibTeX RIS

Imma Gálvez-Carrillo, Leandro Lombardi, Andrew Tonks. 2013-04-01. An A-infinity operad in spineless cacti. https://arxiv.org/abs/1304.0352

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