Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Parallax: possibility of detecting anisotropic expansion of the
  universe by very accurate astrometry measurements   Refined astrometry measurements allow us to detect large-scale deviations
from isotropy through real-time observations of changes in the angular
separation between sources at cosmic distances. This "cosmic parallax" effect
is a powerful consistency test of FRW metric and may set independent
constraints on cosmic anisotropy. We apply this novel general test to LTB
cosmologies with off-center observers and show that future satellite missions
such as Gaia might achieve accuracies that would put limits on the off-center
distance which are competitive with CMB dipole constraints.

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con