Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical investigation of non-Gaussianities in the phase and modulus of
  density Fourier modes   We numerically investigate non-Gaussianities in the late-time cosmological
density field in Fourier space. We explore various statistics, including the
two-point and three-point probability distribution function (PDF) of phase and
modulus, and two \& three-point correlation function of of phase and modulus.
We detect significant non-Gaussianity for certain configurations. We compare
the simulation results with the theoretical expansion series of
\citet{2007ApJS..170....1M}. We find that the $\mathcal{O}(V^{-1/2})$ order
term alone is sufficiently accurate to describe all the measured
non-Gaussianities in not only the PDFs, but also the correlations. We also
numerically find that the phase-modulus cross-correlation contributes $\sim
50\%$ to the bispectrum, further verifying the accuracy of the
$\mathcal{O}(V^{-1/2})$ order prediction. This work demonstrates that
non-Gaussianity of the cosmic density field is simpler in Fourier space, and
may facilitate the data analysis in the era of precision cosmology.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics