How general is the strong cosmic censorship bound for quasinormal modes?

@article{66422,
   author = {Konoplya, Roman and Zhidenko, A.},
   article_location = {GB - Spojené království Velké Británie a},
   article_number = {11},
   doi = {http://dx.doi.org/10.1088/1475-7516/2022/11/028},
   keywords = {quasinormal mode ;black hole;Cauchy horizon;gravitational waves / theory; gravity; modified gravity},
   language = {eng},
   issn = {1475-7516},
   journal = {Journal of Cosmology and Astroparticle Physics},
   title = {How general is the strong cosmic censorship bound for quasinormal modes?},
   url = {https://iopscience.iop.org/article/10.1088/1475-7516/2022/11/028},
   volume = {2022},
   year = {2022}
}

TY  - JOUR
ID  - 66422
AU  - Konoplya, Roman - Zhidenko, A.
PY  - 2022
TI  - How general is the strong cosmic censorship bound for quasinormal modes?
JF  - Journal of Cosmology and Astroparticle Physics
VL  - 2022
IS  - 11
SP  - "028-1"-"028-10"
EP  - "028-1"-"028-10"
SN  - 14757516
KW  - quasinormal mode ;black hole;Cauchy horizon;gravitational waves / theory
KW  - gravity
KW  - modified gravity
UR  - https://iopscience.iop.org/article/10.1088/1475-7516/2022/11/028
N2  - Hod's proposal claims that the least damped quasinormal mode of a black hole must have the imaginary part smaller than half of the surface gravity at the event horizon. The Strong Cosmic Censorship in General Relativity implies that this bound must be even weaker: half of the surface gravity at the Cauchy horizon. The appealing question is whether these bounds are limited by the Einstein theory only? Here we will present numerical evidence that once the black hole size is much smaller than then the radius of the cosmological horizon, both the Hod's proposal and the strong cosmic censorship bound for quasinormal modes are satisfied for general spherically symmetric black holes in an arbitrary metric theory of gravity. The low-lying quasinormal frequencies have the universal behavior in this regime and do not depend on the near-horizon geometry, but only on the asymptotic parameters: the value of the cosmological constant and black hole mass.
ER  - 

KONOPLYA, Roman and A. ZHIDENKO. How general is the strong cosmic censorship bound for quasinormal modes? \textit{Journal of Cosmology and Astroparticle Physics}. GB - Spojené království Velké Británie a, 2022, vol.~2022, No~11, p.~''028-1''-''028-10'', 10 pp. ISSN~1475-7516. Available from: https://dx.doi.org/10.1088/1475-7516/2022/11/028.