{"title":"紧量子群齐次空间的等变谱三元组 \\(U_q(2)\\)","authors":"Satyajit Guin, Bipul Saurabh","doi":"10.1007/s11040-022-09432-7","DOIUrl":null,"url":null,"abstract":"<div><p>In this article, we study homogeneous spaces <span>\\(U_q(2)/_\\phi \\mathbb {T}\\)</span> and <span>\\(U_q(2)/_\\psi \\mathbb {T}\\)</span> of the compact quantum group <span>\\(U_q(2),\\,q\\in {\\mathbb {C}}\\setminus \\{0\\}\\)</span>. The homogeneous space <span>\\(U_q(2)/_\\phi \\mathbb {T}\\)</span> is shown to be the braided quantum group <span>\\(SU_q(2)\\)</span>. The homogeneous space <span>\\(U_q(2)/_\\psi \\mathbb {T}\\)</span> is established as a universal <span>\\(C^*\\)</span>-algebra given by a finite set of generators and relations. Its <span>\\({\\mathcal {K}}\\)</span>-groups are computed and two families of finitely summable odd spectral triples, one is <span>\\(U_q(2)\\)</span>-equivariant and the other is <span>\\(\\mathbb {T}^2\\)</span>-equivariant, are constructed. Using the index pairing, it is shown that the induced Fredholm modules for these families of spectral triples give each element in the <span>\\({\\mathcal {K}}\\)</span>-homology group <span>\\(K^1(C(U_q(2)/_\\psi \\mathbb {T}))\\)</span>.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"25 3","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Equivariant Spectral Triples for Homogeneous Spaces of the Compact Quantum Group \\\\(U_q(2)\\\\)\",\"authors\":\"Satyajit Guin, Bipul Saurabh\",\"doi\":\"10.1007/s11040-022-09432-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this article, we study homogeneous spaces <span>\\\\(U_q(2)/_\\\\phi \\\\mathbb {T}\\\\)</span> and <span>\\\\(U_q(2)/_\\\\psi \\\\mathbb {T}\\\\)</span> of the compact quantum group <span>\\\\(U_q(2),\\\\,q\\\\in {\\\\mathbb {C}}\\\\setminus \\\\{0\\\\}\\\\)</span>. The homogeneous space <span>\\\\(U_q(2)/_\\\\phi \\\\mathbb {T}\\\\)</span> is shown to be the braided quantum group <span>\\\\(SU_q(2)\\\\)</span>. The homogeneous space <span>\\\\(U_q(2)/_\\\\psi \\\\mathbb {T}\\\\)</span> is established as a universal <span>\\\\(C^*\\\\)</span>-algebra given by a finite set of generators and relations. Its <span>\\\\({\\\\mathcal {K}}\\\\)</span>-groups are computed and two families of finitely summable odd spectral triples, one is <span>\\\\(U_q(2)\\\\)</span>-equivariant and the other is <span>\\\\(\\\\mathbb {T}^2\\\\)</span>-equivariant, are constructed. Using the index pairing, it is shown that the induced Fredholm modules for these families of spectral triples give each element in the <span>\\\\({\\\\mathcal {K}}\\\\)</span>-homology group <span>\\\\(K^1(C(U_q(2)/_\\\\psi \\\\mathbb {T}))\\\\)</span>.</p></div>\",\"PeriodicalId\":694,\"journal\":{\"name\":\"Mathematical Physics, Analysis and Geometry\",\"volume\":\"25 3\",\"pages\":\"\"},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2022-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Mathematical Physics, Analysis and Geometry\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11040-022-09432-7\",\"RegionNum\":3,\"RegionCategory\":\"数学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATHEMATICS, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mathematical Physics, Analysis and Geometry","FirstCategoryId":"100","ListUrlMain":"https://link.springer.com/article/10.1007/s11040-022-09432-7","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATHEMATICS, APPLIED","Score":null,"Total":0}
Equivariant Spectral Triples for Homogeneous Spaces of the Compact Quantum Group \(U_q(2)\)
In this article, we study homogeneous spaces \(U_q(2)/_\phi \mathbb {T}\) and \(U_q(2)/_\psi \mathbb {T}\) of the compact quantum group \(U_q(2),\,q\in {\mathbb {C}}\setminus \{0\}\). The homogeneous space \(U_q(2)/_\phi \mathbb {T}\) is shown to be the braided quantum group \(SU_q(2)\). The homogeneous space \(U_q(2)/_\psi \mathbb {T}\) is established as a universal \(C^*\)-algebra given by a finite set of generators and relations. Its \({\mathcal {K}}\)-groups are computed and two families of finitely summable odd spectral triples, one is \(U_q(2)\)-equivariant and the other is \(\mathbb {T}^2\)-equivariant, are constructed. Using the index pairing, it is shown that the induced Fredholm modules for these families of spectral triples give each element in the \({\mathcal {K}}\)-homology group \(K^1(C(U_q(2)/_\psi \mathbb {T}))\).
期刊介绍:
MPAG is a peer-reviewed journal organized in sections. Each section is editorially independent and provides a high forum for research articles in the respective areas.
The entire editorial board commits itself to combine the requirements of an accurate and fast refereeing process.
The section on Probability and Statistical Physics focuses on probabilistic models and spatial stochastic processes arising in statistical physics. Examples include: interacting particle systems, non-equilibrium statistical mechanics, integrable probability, random graphs and percolation, critical phenomena and conformal theories. Applications of probability theory and statistical physics to other areas of mathematics, such as analysis (stochastic pde''s), random geometry, combinatorial aspects are also addressed.
The section on Quantum Theory publishes research papers on developments in geometry, probability and analysis that are relevant to quantum theory. Topics that are covered in this section include: classical and algebraic quantum field theories, deformation and geometric quantisation, index theory, Lie algebras and Hopf algebras, non-commutative geometry, spectral theory for quantum systems, disordered quantum systems (Anderson localization, quantum diffusion), many-body quantum physics with applications to condensed matter theory, partial differential equations emerging from quantum theory, quantum lattice systems, topological phases of matter, equilibrium and non-equilibrium quantum statistical mechanics, multiscale analysis, rigorous renormalisation group.