Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic shear as a tool for precision cosmology: minimising intrinsic
  galaxy alignment-lensing interference   Cosmic shear leads to a correlation of the observed ellipticities of
galaxies, an effect which is used to place constraints on cosmological
parameters, and to explore the evolution of dark matter and dark energy in the
universe. However, a possible systematic contaminant of the lensing signal is
intrinsic galaxy alignment, with a correlation length of a few Mpc. Hirata &
Seljak (2004) have recently demonstrated that for some models of intrinsic
distortions, there may also be a cross-correlation between the intrinsic and
lensing signals, which may dominate the intrinsic signal, and suppress the
lensing power spectrum by several tens of percent. Unlike the pure intrinsic
signal, this new term cannot be accounted for by neglecting or down-weighting
pairs of galaxies which are physically close. Extending the correlation
function tomography method of King & Schneider (2003) we illustrate how the
impact of both intrinsic and cross-correlations can be significantly reduced,
in the context of surveys with photometric redshift information. For a
ground-based cosmic shear survey of ~100 sq. degrees with photometric
redshifts, even in the presence of systematic contaminants at the level
considered here, cosmological models degenerate in the Omega_m-sigma_8 plane
can be distinguished well in excess of the 3-sigma level.

11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph