Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational discrimination of Eddington-inspired Born-Infeld gravity
  from general relativity   Direct observations of neutron stars could tell us an imprint of modified
gravity. However, it is generally difficult to resolve the degeneracy due to
the uncertainties in equation of state (EOS) of neutron star matter and in
gravitational theories. In this paper, we are successful to find the
observational possibility to distinguish Eddington-inspired Born-Infeld gravity
(EiBI) from general relativity. We show that the radii of neutron stars with
$0.5M_{sun}$ are strongly correlated with the neutron skin thickness of
${}^{208}$Pb independently of EOS, while this correlation depends on the
coupling constant in EiBI. As a result, via the direct observations of radius
of neutron star with $0.5M_{sun}$ and the measurements of neutron skin
thickness of ${}^{208}$Pb by the terrestrial experiments, one could not only
discriminate EiBI from general relativity but also estimate the coupling
constant in EiBI.

37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn