Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extended Cosmologies   We shall discuss cosmological models in extended theories of gravitation. We
shall define a surface, called the model surface, in the space of observable
parameters which characterises families of theories. We also show how this
surface can be used to compare with observations. The model surface can
potentially be used to falsify whole families of models instead reasoning on a
single model basis as it is usually done by best fit arguments with
observations.

35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas