The weakly interacting tenfold way

We present implementations of the topological K-theory spectra $KU$ and $KO$ in terms of time evolution operators of irreducible free fermion systems with symmetries, with explicit formulas for the structural suspension maps. We also introduce a geometric definition of weakly interacting time evolution operators, and show how associated spectra $KU^{wi}$ and $KO^{wi}$ deformation retract to $KU$ and $KO$. We thus have a stable homotopy theoretical proof that the tenfold way is stable to weak interactions.

Source: arXiv:2603.16799v1 - http://arxiv.org/abs/2603.16799v1 PDF: https://arxiv.org/pdf/2603.16799v1 Original Link: http://arxiv.org/abs/2603.16799v1