Insights and caveats from mining local and global temporal motifs in cryptocurrency transaction networks
Arnold, N Zhong, P Ba, C Steer, B Mondragon, R Cuadrado, F Lambiotte, R Clegg, R Scientific Reports volume 14 issue 1 (04 Nov 2024)
Absolute concentration robustness algebra and geometry
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Tue, 25 Feb 2025
16:00
C3

Equivariant higher Dixmier-Douady theory for UHF-algebras

Valerio Bianchi
(Cardiff University)
Abstract

A classical result of Dixmier and Douady enables us to classify locally trivial bundles of C*-algebras with compact operators as fibres via methods in homotopy theory. Dadarlat and Pennig have shown that this generalises to the much larger family of bundles of stabilised strongly self-absorbing C*-algebras, which are classified by the first group of the cohomology theory associated to the units of complex topological K-theory. Building on work of Evans and Pennig I consider Z/pZ-equivariant C*-algebra bundles over Z/pZ-spaces. The fibres of these bundles are infinite tensor products of the endomorphism algebra of a Z/pZ-representation. In joint work with Pennig, we show that the theory refines completely to this equivariant setting. In particular, we prove a full classification of the C*-algebra bundles via equivariant stable homotopy theory.

North meets South is an Mathematical Institute tradition founded by and for early-career researchers. One speaker from the North side of the Andrew Wiles Building and one speaker from the South side will each present an idea from their work in an accessible yet intriguing way. 

Today, 4pm, L1

North Paul-Hermann Balduf - Statistics of Feynman integral

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