Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Negative Mass Cosmology in General Relativity   In this Letter we present strong arguments in favour of thoroughly revising
the negative mass cosmology (NMC), which has been proposed as a simple
alternative explanation of dark energy and dark matter effects, within the
framework of General Relativity. We show that there are various physical
predictions in this model which require fine-tuning in order to make them
compatible with current cosmological surveys. In this way, the original
motivation of the NMC model becomes obscured due to the imposition of
fine-tuned unknown variables. We conclude that a more rigorous theoretical
treatment is needed in order to make the NMC a viable cosmological model.

8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th