Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strange stars in $f(\mathcal{R})$ gravity Palatini formalism and
  gravitational wave echoes from them   The compact stars are promising candidates associated with the generation of
gravitational waves (GWs). In this work, we study a special type of compact
stars known as strange stars in the $f(\mathcal{R})$ gravity Palatini
formalism. Here we consider three promising $f(\mathcal{R})$ gravity models
viz., Starobinsky, Hu-Sawicki and Gogoi-Goswami models in the domain of MIT Bag
model and linear equations of state (EoSs). We compute the stellar structures
numerically and constrained the $f(\mathcal{R})$ model parameters with a set of
probable strange star candidates. The study shows that the consideration of
stiffer MIT Bag model and linear EoSs within a favourable set of
$f(\mathcal{R})$ gravity model parameters may result in strange stars with
sufficient compactness to produce echoes of GWs. Thus, we have computed the GWs
echo frequencies and characteristic echo times for such stars. It is found that
in compliance with the experimentally obtained possible strange star
candidates, the obtained GW echo frequencies for all the models are in the
range of $65 - 85$ kHz.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph