Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on bigravity and dark matter   We show that a class of bi-gravity theories contain solutions describing dark
matter. A particular member of this class is also shown to be equivalent to the
Eddington-Born-Infeld gravity, recently proposed as a candidate for dark
matter. Bigravity theories also have cosmological de Sitter backgrounds and we
find solutions interpolating between matter and acceleration eras.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs