2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146948We present an optical cavity QED configuration that is described by a dissipative version of the Lipkin-Meshkov-Glick model of an infinitely coordinated spin system. This open quantum system exhibits both first- and second-order non-equilibrium quantum phase transitions as a single, effective field parameter is varied. Light emitted from the cavity offers measurable signatures of the critical behavior, including that of the spin-spin entanglement.4 pages, 4 figures, typos corrected and other minor changesQuantum PhysicsOther Condensed Mattertext