Year: 2026
Type: preprint
Abstract: Exceptional points (EPs) and eigenstate hysteresis, previously found in Kerr only with an auxiliary scalar field, arise intrinsically in the quasinormal-mode spectrum of Kerr-Newman black holes. Using a hyperboloidal formulation of the coupled gravito-electromagnetic Teukolsky equations and a Chebyshev pseudospectral method, we compute the $\ell=m=2$ spectrum and locate four EPs at up to $99.974\%$ of extremality, one from a new repulsion. The gaps close as a square root branch point, and quasistatic loops around one or more EPs exchange the coalescing modes, confirming hysteresis.
Source: arXiv (Cornell University)
Institution: Institut d'Estudis Espacials de Catalunya
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1092424111, G121809054, G1855990336, G1981146104, G2038104832, G2064873908, G2309174360, G2355262757, G2462415295, G2660406951, G279363373, G2863668859, G288263039, G3005324705, G3288897321, G3439265645, G3518538256, G3546882995, G4019291869, G430777504, G5044876070, G5421974903, G5852091828, G6042039961, G6149273910, G617610489, G6366842693, G6513613686, G69051668, G7318436308, G7725594341, G7880944295, G8920660035, G897484643, G944666937, G99296377
OpenAlex ID: W7223253451