Mathematics – Operator Algebras
Scientific paper
2008-11-24
Mathematics
Operator Algebras
v2: several typos corrected; v1: LaTeX, 50 pages
Scientific paper
The odd dimensional quantum sphere $S_q^{2\ell+1}$ is a homogeneous space for the quantum group $SU_q(\ell+1)$. A generic equivariant spectral triple for $S_q^{2\ell+1}$ on its $L_2$ space was constructed by Chakraborty & Pal. We prove regularity for that spectral triple here. We also compute its dimension spectrum and show that it is simple. We give detailed construction of its smooth function algebra and some related algebras that help proving regularity and in the computation of the dimension spectrum. Following the idea of Connes for $SU_q(2)$, we first study another spectral triple for $S_q^{2\ell+1}$ equivariant under torus group action constructed by Chakraborty & Pal. We then derive the results for the $SU_q(\ell+1)$-equivariant triple in the $q=0$ case from those for the torus equivariant triple. For the $q\neq 0$ case, we deduce regularity and dimension spectrum from the $q=0$ case.
Pal Arupkumar
Sundar S.
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