The $θ$ vacuum reveals itself as the fundamental theory of the quantum Hall effect II. The Coulomb interaction

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95231Within the Grassmannian $U(2N) / U(N) \times U(N)$ non-linear $σ$ model representation of localization one can study the low energy dynamics of both the free and interacting electron gas. We study the cross-over between these two fundamentally different physical problems. We show how the topological arguments for the exact quantization of the Hall conductance are extended to include the Coulomb interaction problem. We discuss dynamical scaling and make contact with the theory of variable range hopping.4 RevTex pages and 1 figureMesoscale and Nanoscale PhysicsDisordered Systems and Neural NetworksThe $θ$ vacuum reveals itself as the fundamental theory of the quantum Hall effect II. The Coulomb interactiontext