Symmetry of quantum torus with crossed product algebra

In this paper, we study the symmetry of quantum torus with the concept of crossed product algebra. As a classical counterpart, we consider the orbifold of classical torus with complex structure and investigate the transformation property of classical theta function. An invariant function under the g...

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Bibliographic Details
Published in:Journal of mathematical physics 2006-07, Vol.47 (7), p.073508-073508-10
Main Authors: Chang-Young, Ee, Kim, Hoil
Format: Article
Language:English
Subjects:
Algebra
Analysis
Exact sciences and technology
Mathematical methods in physics
Mathematics
Physics
Quantum field theory
Sciences and techniques of general use
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Summary:In this paper, we study the symmetry of quantum torus with the concept of crossed product algebra. As a classical counterpart, we consider the orbifold of classical torus with complex structure and investigate the transformation property of classical theta function. An invariant function under the group action is constructed as a variant of the classical theta function. Then our main issue, the crossed product algebra representation of a quantum torus with complex structure under the symplectic group, is analyzed as a quantum version of orbifolding. We perform this analysis with Manin’s so-called model II quantum theta function approach. The symplectic group S p ( 2 n , Z ) satisfies the consistency condition of a crossed product algebra representation of quantum torus times the algebra of functions on the Siegel space. However, only a subgroup of S p ( 2 n , Z ) satisfies the consistency condition for orbifolding of the quantum torus.
ISSN:0022-2488
1089-7658
DOI:10.1063/1.2219160