2026/02/24 by Bekir Can Lütfüoğlu, B. C. Lütfüoğlu, Javlon Rayimbaev +3
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Gravitation #Halo #Oscillation (cell signaling) #Pulsars and Gravitational Waves Research #Quasinormal mode #Resummation #Schwarzschild radius #Singularity #WKB approximation #gr-qc
paper · pdf · doi:10.1016/j.aop.2026.170664
published as Annals Phys. 494, 170664 (2026) · 12 pages, 2 figures, 8 tables
arxiv created 2026/02/24 · openalex publication_date 2026/07/31 · openalex created_date 2026/08/01 · openalex updated_date 2026/08/04 · arxiv updated 2026/08/05
We investigate axial gravitational perturbations and quasinormal modes of regular black holes supported by an Einasto distribution of matter. Halo matter not only removes the central singularity but also modifies the quasinormal spectrum. We show that the resulting quasinormal spectrum deviates systematically from the Schwarzschild case, with shifts in both oscillation frequencies and damping rates that grow with the halo scale parameter and the Einasto index. In near-extremal configurations, the damping rate can be significantly suppressed, leading to long-lived modes. The effects of regularity and environmental factors on the spectrum are found to be substantially larger than the estimated numerical uncertainty, as confirmed independently by high-order WKB calculations with Padé resummation and time-domain integration.