Colavincenzo, Manuel; Sefusatti, Emiliano; Monaco, Pierluigi; Blot, Linda; Crocce, Martin; Lippich, Martha; Sánchez, Ariel G.; Alvarez, Marcelo A.; Agrawal, Aniket; Avila, Santiago; Balaguera-Antolínez, A.; Bond, Richard; Codis, Sandrine; Dalla Vecchia, C.; Dorta, A.; Fosalba, Pablo; Izard, Albert; Kitaura, F.-S.; Pellejero-Ibanez, M.; Stein, George; Vakili, Mohammadjavad; Yepes, Gustavo
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, p.4883-4905
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2
2019
Citations
70
Refereed citations
68
Description
We compare the measurements of the bispectrum and the estimate of its
covariance obtained from a set of different methods for the efficient
generation of approximate dark matter halo catalogues to the same
quantities obtained from full N-body simulations. To this purpose we
employ a large set of 300 realizations of the same cosmology for each
method, run with matching initial conditions in order to reduce the
contribution of cosmic variance to the comparison. In addition, we
compare how the error on cosmological parameters such as linear and
non-linear bias parameters depends on the approximate method used for
the determination of the bispectrum variance. As general result, most
methods provide errors within 10 per cent of the errors estimated from
N-body simulations. Exceptions are those methods requiring calibration
of the clustering amplitude but restrict this to 2-point statistics.
Finally we test how our results are affected by being limited to a few
hundreds measurements from N-body simulation by comparing with a larger
set of several thousands of realizations performed with one approximate
method.
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