Algebraic deformations arising from orbifolds with discrete torsion

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We develop methods for computing Hochschild cohomology groups and deformations of crossed product rings. We use these methods to find deformations of a ring associated to a particular orbifold with discrete torsion, and give a presentation of the center of the resulting deformed ring. This connects with earlier calculations by Vafa and Witten of chiral numbers and deformations of a similar orbifold.
19 pages, LaTeX2e; final version to appear in JPAA

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K-Theory and Homology, High Energy Physics - Theory, Rings and Algebras, 16E40 (primary) 16S40, 81T30, 81T75

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http://salesiana.dossiersoluciones.com/handle/123456789/65146

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0210027
 http://arxiv.org/abs/math/0210027

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arXiv