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Assessing non-linear models for galaxy clustering III: theoretical accuracy for Stage IV surveys

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We provide in depth MCMC comparisons of two different models for the halo redshift space power spectrum, namely a variant of the commonly applied Taruya-Nishimichi-Saito (TNS) model and an effective field theory of large scale structure (EFTofLSS) inspired model. Using many simulation realisations and Stage IV survey-like specifications for the covariance matrix, we check each model's range of validity by testing for bias in the recovery of the fiducial growth rate of structure formation. The robustness of the determined range of validity is then tested by performing additional MCMC analyses using higher order multipoles, a larger survey volume and a more highly biased tracer catalogue. We find that under all tests, the TNS model's range of validity remains robust and is found to be much higher than previous estimates. The EFTofLSS model fails to capture the spectra for highly biased tracers as well as becoming biased at higher wavenumbers when considering a very large survey volume. Further, we find that the marginalised constraints on $f$ for all analyses are stronger when using the TNS model.
Original languageEnglish
Article number21
Number of pages28
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
Publication statusPublished - 8 Oct 2019


  • 1905.05135v2

    Rights statement: This Accepted Manuscript is available for reuse under a CC BY-NC-ND 3.0 licence after the 12 month embargo period provided that all the terms of the licence are adhered to.

    Accepted author manuscript (Post-print), 3.3 MB, PDF document

    Due to publisher’s copyright restrictions, this document is not freely available to download from this website until: 8/10/20

    Licence: CC BY-NC-ND

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