Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new look at lines of sight: using Fourier methods for the wide-angle
  anisotropic 2-point correlation function   The anisotropic 2-point correlation function (2PCF) of galaxies measures
pairwise clustering as a function of the pair separation's angle to the line of
sight. The latter is often defined as either the angle bisector of the
observer-galaxy-pair triangle or the vector from the observer to the separation
midpoint. Here we show how to accelerate either of these measurements with
Fourier Transforms, using a slight generalization of the Yamamoto et al. (2006)
estimator in which each member of the pair is used successively as the line of
sight. We also present perturbation theory predictions for our generalized
estimator including wide-angle corrections.

1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th