Vortex ground states for Klein-Gordon-Maxwell-Proca type systems
  We look for three dimensional vortex-solutions, which have finite energy and are stationary solutions, of Klein-Gordon-Maxwell-Proca type systems of equations. We prove the existence of three dimensional cylindrically symmetric vortex-solutions having a least possible energy among all symmetric solutions. Moreover we show that, if the Proca mass disappears, then the solutions tends to a solution of the Klein-Gordon-Maxwell system. 
Pietro d'Avenia, Jaros{\l}aw Mederski, Alessio Pomponio
math.AP