Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconstruction of f(R) gravity models from observations   We investigate the method for the reconstruction of f(R) gravity models both
from the background evolution observations and from the large scale structure
measurements. Due to the lack of the first principles, one needs to rely on the
observations to build the $f(R)$ gravity models. We show that the general
$f(R)$ models can be specified if the 5\% accuracy level large scale structure
formation observations will be available in the near future.

35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph