Topological homology of rings with twisted group action

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• Mona Merling (University of Pennsylvania)
• Tuesday 13 May 2025, 11:45-12:45
• Seminar Room 1, Newton Institute.

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EHTW03 - New horizons for equivariance in homotopy theory

Topological Hochschild homology, an invariant of ring spectra, is the realization of a cyclic object defined using Connes’ cyclic category and it carries an action of the circle. Real topological Hochschild homology, an invariant of ring spectra with involution, is the realization of a dihedral object defined using the dihedral category and it carries an action of O(2). In this talk, we describe a simultaneous generalization of these constructions, a topological version of homology which takes as input rings with twisted group action, which generalize rings with involution. A new example of interest of this construction is quaternionic topological Hochschild homology, which carries a Pin(2)-action. This is joint work with Gabriel Angelini-Knoll and Maximilien Péroux.

This talk is part of the Isaac Newton Institute Seminar Series series.

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