Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular Cross-Correlation of Galaxies: A Probe of Gravitational Lensing
  by Large-Scale Structure   The angular cross-correlation between two galaxy samples separated in
redshift is shown to be a useful measure of weak lensing by large-scale
structure. Angular correlations in faint galaxies arise due to spatial
clustering of the galaxies as well as gravitational lensing by dark matter
along the line-of-sight. The lensing contribution to the 2-point
auto-correlation function is typically small compared to the gravitational
clustering. However the cross-correlation between two galaxy samples is nearly
unaffected by gravitational clustering provided their redshift distributions do
not overlap. The cross-correlation is then induced by magnification bias due to
lensing by large-scale structure. We compute the expected amplitude of the
cross-correlation for popular theoretical models of structure formation. For
two populations with mean redshifts of $\simeq 0.3$ and 1, we find a
cross-correlation signal of $\simeq 1%$ on arcminute scales and $\simeq 3%$ on
a few arcseconds. The dependence on the cosmological parameters $\Omega$ and
$\Lambda$, on the dark matter power spectrum and on the bias factor of the
foreground galaxy population is explored.

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The categories of this paper are: hep-ex
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
19
The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin