4 papers
On gauging Abelian extensions of finite and U(1) groups
Riccardo Villa
We consider Abelian extensions of global symmetries of the form , with finite. For a quantum field theory with symmetry , we compare gauging …
Gauging in superconductors and other electronic systems
Marcus Berg, Andrea Cappelli, Riccardo Villa
Ordinary, s-wave superconductors have been recognized as being topological phases of matter, in which the dynamical gauge field implies less understood global features. Using the t…
Bosonizations and dualities in 2+1 dimensions
Andrea Cappelli, Riccardo Villa
We discuss two methods for relating bosonic and fermionic relativistic field theories in 2+1 dimensions, the gauging and the flux attachment. The first is primarily a corre…
Bosonization of 2+1 dimensional fermions on the surface of topological insulators
Andrea Cappelli, Lorenzo Maffi, Riccardo Villa
Three-dimensional topological insulators can be described by an effective field theory involving two `hydrodynamic' Abelian gauge fields. The action contains a bulk topological BF…