[geometry-ml:06176] Re: CREST seminars

[Yasuyuki Kawahigashi]

皆様，
次回4月4日，次々回5月2日の CREST オンラインセミナーは以下のようになります． Zoom 
リンクご希望の方は下記ページで登録をお願いします．(リンクは毎回同じですので登録済みの方は 
再登録は不要です．)
https://www.ms.u-tokyo.ac.jp/~yasuyuki/crest-seminar.htm
河東泰之
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Speaker: Yosuke Kubota (Kyoto University)
Title: Stable homotopy theory of invertible gapped quantum spin systems
Date/Time: 16:00-17:30, Friday, April 4, 2025
Abstract: In the past decade, A. Kitaev proposed that the set of invertible 
gapped quantum spin systems would form an \Omega-spectrum. This conjecture 
has potentially significant application to the study of SPT phases. We give 
a mathematically rigorous realization of this proposal with the language of 
functional analysis and operator algebra. Furthermore, we formulate the 
idea of placing a quantum spin system on a general space beyond R^n, which 
gives rise to a model of the generalized homology theory associated with 
Kitaev's spectrum. As an application, we study the topological phase of 
invertible phases protected by a crystallographic symmetry. This talk is 
based on the preprint https://arxiv.org/abs/2503.12618.

Speaker: Okuto Morikawa (RIKEN)
Title: Winding number on 3D lattice
Date/Time: 16:00-17:30, Friday, May 2, 2025