Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetized relativistic stellar models in Eddington-inspired Born-Infeld
  gravity   We consider the structure of the magnetic fields inside the neutron stars in
Eddington-inspired Born-Infeld (EiBI) gravity. In order to construct the
magnetic fields, we derive the relativistic Grad-Shafranov equation in EiBI,
and numerically determine the magnetic distribution in such a way that the
interior magnetic fields should be connected to the exterior distribution.
Then, we find that the magnetic distribution inside the neutron stars in EiBI
is qualitatively similar to that in general relativity, where the deviation of
magnetic distribution in EiBI from that in general relativity is almost
comparable to uncertainty due to the equation of state (EOS) for the neutron
star matter. However, we also find that the magnetic fields in the crust region
are almost independent of the coupling constant in EiBI, which suggests a
possibility to obtain the information about the crust EOS independently of the
gravitational theory via the observations of the phenomena associated with the
crust region. In any case, since the imprint of EiBI gravity on the magnetic
fields is weak, the magnetic fields could be a poor probe of gravitational
theories, considering many magnetic uncertainties.

37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph