Please contact rishi(at)theory(dot)tifr(dot)res(dot)in for the zoom meeting id and the password for this seminar.
In extensions of the gauge group rank of the Standard Model (SM), one wishes to ascribe an additional charge under the additional $u(1)$ subgroup to the chiral fermions. Such charges are constrained by anomaly cancellation conditions. We consider models with SM fermions plus SM singlets (which could play the role of right-handed neutrinos, for example). We discuss methods of solution of the anomaly cancellation conditions using geometric methods, arriving at an analytic solution for SM chiral fermion charges.