3 papers
math.QA2026
Coquasi-bialgebroids and cocycle twisting
Xiao Han, Shahn Majid
We introduce coquasi-bialgebroids over a noncommutative base algebra. Using Takeuchi's \(\times_B\)-coalgebra formalism, we require the coproduct to remain an algebra map into the…
hep-th2025
Finite group gauge theory on graphs and gravity-like modes
Shahn Majid, Francisco Simão
We study gauge theory with finite group on a graph using noncommutative differential geometry and Hopf algebra methods with -valued holonomies replaced by gauge fields v…
hep-th2025
Fermions in the fuzzy sphere Kaluza-Klein model
Chengcheng Liu, Shahn Majid
We consider spinors on the total space of a Kaluza-Klein model with fuzzy sphere fibre and geometrically realised Dirac operator on the product. We show that a single massless spin…