2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/176953An Abelian gerbe is constructed over classical phase space. The 2-cocycles defining the gerbe are given by Feynman path integrals whose integrands contain the exponential of the Poincare-Cartan form. The U(1) gauge group on the gerbe has a natural interpretation as the invariance group of the Schroedinger equation on phase space.9Quantum PhysicsMathematical Physicstext