Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Combined Rastall and Rainbow theories of gravity with applications to
  neutron stars   The possibility of modifications on general relativity is investigated. We
propose an alternative theory of gravity constructed with the combination of
Rastall and Rainbow theories. The hydrostatic equilibrium equations are
obtained in order to test the new theory in neutron stars, whose mass-radius
diagrams are obtained using modern equations of state of nuclear matter derived
from relativistic mean field models and compared with the ones computed by the
Tolman-Oppenheimer-Volkoff equations. We conclude that substantial
modifications are obtained even for very small alterations on the two free
parameters, making the reproduction of astrophysical observations an easy task.

10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci