Quantum Galois groups of subfactors
Quantum Galois groups of subfactors
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DOI:
10.1142/s0129167x22500136
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发表时间:
2021-01
影响因子:
0.6
通讯作者:
S. Bhattacharjee;A. Chirvasitu;Debashish Goswami
中科院分区:
文献类型:
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作者:
S. Bhattacharjee;A. Chirvasitu;Debashish Goswami
For a finite-index [Formula: see text] subfactor [Formula: see text], we prove the existence of a universal Hopf ∗-algebra (or, a discrete quantum group in the analytic language) acting on [Formula: see text] in a trace-preserving fashion and fixing [Formula: see text] pointwise. We call this Hopf ∗-algebra the quantum Galois group for the subfactor and compute it in some examples of interest, notably for arbitrary irreducible finite-index depth-two subfactors. Along the way, we prove the existence of universal acting Hopf algebras for more general structures (tensors in enriched categories), in the spirit of recent work by Agore, Gordienko and Vercruysse.