Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-precision Monte-Carlo modelling of galaxy distribution   We revisit the case of fast Monte-Carlo simulations of galaxy positions for a
non-gaussian field. More precisely we address the question of generating a 3D
field with a given one-point function (as a log-normal one, but not only) and
some power-spectrum fixed by cosmology. We highlight and investigate a problem
that occurs when the field is filtered and identify, for the log-normal case, a
regime where it can still be used. However we show that the filtering is
unnecessary if one takes into account aliasing effects and finely controls the
discrete sampling step. In this way we demonstrate a sub-percent precision of
all our spectra up to the Nyquist frequency. We extend the method to generate a
full light cone evolution comparing two methods for doing it and validate our
method with a tomographic analysis. We investigate analytically and numerically
the structure of the covariance matrices obtained with such simulations which
may be useful for future large and deep surveys.

30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn