Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing Einstein Gravity with Cosmic Growth and Expansion   We test Einstein gravity using cosmological observations of both expansion
and structure growth, including the latest data from supernovae (Union2.1), CMB
(WMAP7), weak lensing (CFHTLS) and peculiar velocity of galaxies (WiggleZ). We
fit modified gravity parameters of the generalized Poisson equations
simultaneously with the effective equation of state for the background
evolution, exploring the covariances and model dependence. The results show
that general relativity is a good fit to the combined data. Using a Pad{\'e}
approximant form for the gravity deviations accurately captures the time and
scale dependence for theories like $f(R)$ and DGP gravity, and weights high and
low redshift probes fairly. For current observations, cosmic growth and
expansion can be fit simultaneously with little degradation in accuracy, while
removing the possibility of bias from holding one aspect fixed.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
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
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga