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  Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles

Blot, L., Crocce, M., Sefusatti, E., Lippich, M., Sánchez, A. G., Colavincenzo, M., et al. (2019). Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles. Monthly Notices of the Royal Astronomical Society, 485(2), 2806-2824. doi:10.1093/mnras/stz507.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-74B5-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-74B6-C
Genre: Journal Article

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The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey evolution of higher-order correlations demonstrated with Minkowski functionals.pdf (Any fulltext), 3MB
 
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Blot, Linda, Author
Crocce, Martin, Author
Sefusatti, Emiliano, Author
Lippich, Martha, Author
Sánchez, Ariel G., Author
Colavincenzo, Manuel, Author
Monaco, Pierluigi, Author
Alvarez, Marcelo A., Author
Agrawal, Aniket1, Author              
Avila, Santiago, Author
Balaguera-Antolínez, Andrés, Author
Bond, Richard, Author
Codis, Sandrine, Author
Vecchia, Claudio Dalla, Author
Dorta, Antonio, Author
Fosalba, Pablo, Author
Izard, Albert, Author
Kitaura, Francisco-Shu, Author
Pellejero-Ibanez, Marcos, Author
Stein, George, Author
Vakili, Mohammadjavad, AuthorYepes, Gustavo, Author more..
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We study the accuracy of several approximate methods for gravitational dynamics in terms of halo power spectrum multipoles and their estimated covariance matrix. We propagate the differences in covariances into parameter constraints related to growth rate of structure, Alcock–Paczynski distortions, and biasing. We consider seven methods in three broad categories: algorithms that solve for halo density evolution deterministically using Lagrangian trajectories (ICE–COLA, pinocchio, and peakpatch), methods that rely on halo assignment schemes on to dark matter overdensities calibrated with a target N-body run (halogen, patchy), and two standard assumptions about the full density probability distribution function (Gaussian and lognormal). We benchmark their performance against a set of three hundred N-body simulations, running similar sets of approximate simulations with matched initial conditions, for each method. We find that most methods reproduce the monopole to within 5 per cent⁠, while residuals for the quadrupole are sometimes larger and scale dependent. The variance of the multipoles is typically reproduced within 10 per cent⁠. Overall, we find that covariances built from approximate simulations yield errors on model parameters within 10 per cent of those from the N-body-based covariance.

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 Dates: 2019-02-19
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz507
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 485 (2) Sequence Number: - Start / End Page: 2806 - 2824 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470