The Structure of Noncommutative Deformations

Details The Structure of Noncommutative Deformations The Structure of Noncommutative Deformations

2005-04-12

arxiv.org/abs/math/0504232v2

Mathematics

Quantum Algebra

36 pages, 1 figure. Expands upon my earlier paper math.QA/0211203

Scientific paper

Noncommutatively deformed geometries, such as the noncommutative torus, do not exist generically. I showed in a previous paper that the existence of such a deformation implies compatibility conditions between the classical metric and the Poisson bivector (which characterizes the noncommutativity). Here I present another necessary condition: the vanishing of a certain rank 5 tensor. In the case of a compact Riemannian manifold, I use these conditions to prove that the Poisson bivector can be constructed locally from commuting Killing vectors.

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