Puebla, RicardoRelaño Pérez, ArmandoRetamosa Granado, Joaquín2023-06-202023-06-202013978-0-7354-1165-410.1063/1.4810842https://hdl.handle.net/20.500.14352/45632© 2013 AIP Publishing LLC. La Rabida 2012 International Scientific Meeting on Nuclear Physics (2012. La Rábida (España).A method to find the Excited-States Quantum Phase Transitions (ESQPT's) from parity-symmetry in the Dicke model is studied and presented. This method allows us to stablish a critical energy where ESQPT's take places, and divides the whole energy spectrum in two regions with different properties.engbook parthttp://dx.doi.org/10.1063/1.4810842http://scitation.aip.org/open access536Quantum phase transitionSpontaneous symmetry-breakingFísica (Física)22 Física