Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi-normal modes of massless scalar fields for charged black holes in
  the Palatini-type gravity   The scrutiny of black hole perturbations and its application to testing
gravity theories have been a very crucial frontier in modern physics. In this
paper we study the quasi-normal modes (QNM) of massless scalar perturbations
for various charged black holes in the Palatini-type theories of gravity.
Specifically, we consider the Palatini $f(R)$ theory coupled with Born-Infeld
nonlinear electrodynamics and the Eddington-inspired-Born-Infeld gravity (EiBI)
coupled with Maxwell electromagnetic fields. Special attention is paid to
Einstein-Born-Infeld black holes, EiBI charged black holes and Born-Infeld
charged black holes within $R\pm R^2$ gravity. These charged black holes are
shown to be stable and their quasi-normal frequencies, including the
frequencies in the eikonal limit, are calculated by using the WKB method up to
the 6th order. We compare the results with the Reissner-Nordstr\"om charged
black hole and prove that both the changes in the gravity sector and the matter
sector of the action alter the QNM spectra.

0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin