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Reversible skew Laurent polynomial rings and deformations of Poisson automorphisms. (English) Zbl 1188.16022
The authors consider the skew Laurent polynomial ring $$S=R[x^{\pm 1};\alpha]$$, where $$\alpha$$ is an automorphism of $$R$$, and study involutions $$\theta$$ on $$S$$ such that $$\theta(x)=x^{-1}$$ and the restriction $$\theta|_R$$ is an involution $$\gamma$$ of $$R$$. They show that such $$\theta$$ exists if and only if $$\gamma\alpha\gamma^{-1}=\alpha^{-1}$$, in which case they say that $$\theta$$ is a reversing automorphism and $$S$$ is a reversible skew Laurent polynomial ring. The concept of reversibility arises in dynamical systems and the theory of flows.
The authors study invariants for reversing automorphisms and then apply their results to two principal examples: the localization at the powers of a normal element of the enveloping algebra of the two-dimensional non-Abelian Lie algebra and the coordinate ring of the quantum torus. Both these rings are deformations of Poisson algebras over the base field $$\mathbb{F}$$ and in each case the ring of $$\theta$$-invariants is a deformation of the coordinate ring of a surface in $$\mathbb{F}^3$$ and is a factor of a deformation of $$\mathbb{F}[x_1,x_2,x_3]$$ for a Poisson bracket determined by the appropriate surface. Both deformations are examples of algebras determined by noncommutative potentials.

##### MSC:
 16S36 Ordinary and skew polynomial rings and semigroup rings 16W20 Automorphisms and endomorphisms 17B63 Poisson algebras 16S80 Deformations of associative rings 16W22 Actions of groups and semigroups; invariant theory (associative rings and algebras) 16W10 Rings with involution; Lie, Jordan and other nonassociative structures
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