Associative algebra deformations of the Connes-Moscovici's Hopf algebra $\mathcal{H}_1$

Details Associative algebra deformations of the Connes-Moscovici's Hopf algebra $\mathcal{H}_1$ Associative algebra deformations of the Connes-Moscovici's Hopf algebra $\mathcal{H}_1$

2008-08-27

arxiv.org/abs/0808.3653v2

Mathematics

Quantum Algebra

14 pages

Scientific paper

We compute the second Hochschild cohomology space $HH^2(\mathcal{H}_1)$ of Connes-Moscovici's Hopf algebra $\mathcal{H}_1$, giving the infinitesimal deformations (up to equivalence) of the associative structure. $HH^2(\mathcal{H}_1)$ is shown to be one dimensional, and thus Connes-Moscovici's formal deformation of $\mathcal{H}_1$ using Rankin-Cohen brackets is unique up to equivalence.

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