Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic stars in 4D Einstein-Gauss-Bonnet gravity   In the present paper we investigate the structure of relativistic stars in 4D
Einstein-Gauss-Bonnet gravity. The mass-radius relations are obtained for
realistic hadronic and for strange quark star equations of state, and for a
wide range of the Gauss-Bonnet coupling parameter $\alpha$. Even though the
deviations from general relativity for nonzero values of $\alpha$ can be large
enough, they are still comparable with the variations due to different modern
realistic equations of state if we restrict ourselves to moderate value of
$\alpha$. That is why the current observations of the neutron star masses and
radii alone can not impose stringent constraints on the value of the parameter
$\alpha$. Nevertheless some rough constraints on $\alpha$ can be put. The
existence of stable stellar mass black holes imposes $\sqrt{\alpha}\lesssim 2.6
{\rm km}$ for $\alpha>0$ while the requirement that the maximum neutron star
mass should be greater than two solar masses gives $\sqrt{|\alpha|}\lesssim 3.9
{\rm km}$ for $\alpha<0$. We also present an exact solution describing the
structure of relativistic stars with uniform energy density in 4D
Einstein-Gauss-Bonnet gravity.

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The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an