Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deformation of algebras associated with group cocycles   We study deformation of algebras with coaction symmetry of reduced algebra of
discrete groups, where deformation parameter is given continuous family of
group 2-cocycles. When the group satisfies the Baum-Connes conjecture with
coefficients, we obtain isomorphism of K-groups of the deformed algebras. This
extends both the $\theta$-deformation of Rieffel on $T^n$-actions, and a recent
result of Echterhoff, L\"uck, Phillips, and Walters on the K-groups on the
twisted group algebras.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: eess