Groups, cacti and framed little discs

Details Groups, cacti and framed little discs Groups, cacti and framed little discs

2010-09-16

arxiv.org/abs/1009.3260v1

Mathematics

Algebraic Topology

40 pages

Scientific paper

Let G be a topological group. Then the based loopspace of G is an algebra over the cacti operad, while the double loopspace of the classifying space of G is an algebra over the framed little discs operad. This paper shows that these two algebras are equivalent, in the sense that they are weakly equivalent E-algebras, where E is an operad weakly equivalent to both framed little discs and cacti. We recover the equivalence between cacti and framed little discs, and Menichi's isomorphism between the BV-algebras obtained by taking the homology of the loopspace of G and of the double loopspace of BG.

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