Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FLRW-Cosmology in Generic Gravity Theories   We prove that for the Friedmann-Lemaitre-Robertson-Walker metric, the field
equations of any generic gravity theory in arbitrary dimensions are of the
perfect fluid type. The cases of general Lovelock and $\mathcal{F}(R,
\mathcal{G})$ theories are given as examples.

3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an