Breaking of isospectrality of quasinormal modes in nonrotating loop quantum gravity black holes Del Corral, Daniel Olmedo Nieto, Javier Antonio We acknowledge D. Brizuela, R. Gambini, J. L. Jaramillo, J. Martos, J. Pullin, and C. Sopuerta for very useful comments. This work is supported by the Spanish Government through the Projects No. PID2020– 118159 GB-C43, No. PID2019–105943 GB-I00 (with FEDER contribution), and the “Operative Program FEDER2014-2020 Junta de Andalucía-Consejería de Economía y Conocimiento” under Project No. E-FQM- 262-UGR18 by Universidad de Granada. Daniel del-Corral is grateful for the support of Grant No. UI/BD/151491/ 2021 from the Portuguese Agency Fundao para a Cincia e a Tecnologia. This research was funded by Fundao para a Cincia e a Tecnologia Grant No. UIDB/MAT/00212/2020. We study the quasinormal frequencies of three effective geometries of nonrotating regular black holes derived from loop quantum gravity. Concretely, we consider the Ashtekar-Olmedo-Singh and two Gambini- Olmedo-Pullin prescriptions. We compute the quasinormal frequencies of axial and polar perturbations adopting a WKB method. We show that they differ from those of classical general relativity and, more importantly, that isospectrality is broken. Nevertheless, these deviations are tiny, even for microscopic black holes, and they decay following an inverse power law of the size of the mass of the black holes. For the sake of completeness, we also analyze scalar and vector perturbations, reaching similar conclusions. 2022-05-12T06:55:50Z 2022-05-12T06:55:50Z 2022-03-28 journal article Del Corral, D. & Olmedo, J. Breaking of isospectrality of quasinormal modes in nonrotating loop quantum gravity black holes. PHYSICAL REVIEW D 105, 064053 (2022). DOI: [10.1103/PhysRevD.105.064053] http://hdl.handle.net/10481/74805 10.1103/PhysRevD.105.064053 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España American Physical Society