Vortices in Maxwell-Higgs models with a global factor

This paper deals with planar vortices in a generalized model that presents a global factor which depends on the scalar field in the Nielsen-Olesen Lagrange density. We show that the system supports a first-order framework. Contrary to what occurs with kinks in the line, planar vortices require the presence of constraints that brings modifications into the first-order equations. Novel features are unveiled, such as finite energy configurations with infinite energy density at the origin and the presence of parameters that modifies the energy, keeping the solutions unchanged.