Clustering and redshift-space distortions in modified gravity models with massive neutrinos

García-Farieta, Jorge Enrique; Marulli, F.; Veropalumbo, Alfonso; Moscardini, L.; Casas-Miranda, R.; Giocoli, Carlo; Baldi, Marco

doi:10.1093/mnras/stz1850

Cited by 24 publications

(20 citation statements)

References 114 publications

(145 reference statements)

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“…A work that appeared shortly after this paper studied RSD in halos from simulations with f (R) gravity and massive neutrinos and reached conclusions broadly similar to our own [67].…”

Section: Discussionsupporting

confidence: 72%

Investigating the degeneracy between modified gravity and massive neutrinos with redshift-space distortions

Wright

Koyama

Winther

et al. 2019

J. Cosmol. Astropart. Phys.

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There is a well known degeneracy between the enhancement of the growth of large-scale structure produced by modified gravity models and the suppression due to the free-streaming of massive neutrinos at late times. This makes the matter power-spectrum alone a poor probe to distinguish between modified gravity and the concordance ΛCDM model when neutrino masses are not strongly constrained. In this work, we investigate the potential of using redshift-space distortions (RSD) to break this degeneracy when the modification to gravity is scale-dependent in the form of Hu-Sawicki f (R). We find that if the linear growth rate can be recovered from the RSD signal, the degeneracy can be broken at the level of the dark matter field. However, this requires accurate modelling of the non-linearities in the RSD signal, and we here present an extension of the standard perturbation theory based model for non-linear RSD that includes both Hu-Sawicki f (R) modified gravity and massive neutrinos.

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“…A work that appeared shortly after this paper studied RSD in halos from simulations with f (R) gravity and massive neutrinos and reached conclusions broadly similar to our own [67].…”

Section: Discussionsupporting

confidence: 72%

Investigating the degeneracy between modified gravity and massive neutrinos with redshift-space distortions

Wright

Koyama

Winther

et al. 2019

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…In principle, there would always be a possibility to assume a very special modification of General Relativity that would counteract the effect of neutrino masses and relax the bounds (see e.g. [83][84][85][86]). We could also have a process that changes the relic neutrino distribution [87], or future data analyses could return a slightly inconsistent picture calling for a new baseline cosmological model, in which neutrino mass effects might be more difficult to constrain.…”

Section: Discussionmentioning

confidence: 99%

The promising future of a robust cosmological neutrino mass measurement

Brinckmann

Hooper

Archidiacono

et al. 2019

J. Cosmol. Astropart. Phys.

147

141

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We forecast the sensitivity of thirty-five different combinations of future Cosmic Microwave Background and Large Scale Structure data sets to cosmological parameters and to the total neutrino mass. We work under conservative assumptions accounting for uncertainties in the modelling of systematics. In particular, for galaxy redshift surveys, we remove the information coming from non-linear scales. We use Bayesian parameter extraction from mock likelihoods to avoid Fisher matrix uncertainties. Our grid of results allows for a direct comparison between the sensitivity of different data sets. We find that future surveys will measure the neutrino mass with high significance and will not be substantially affected by potential parameter degeneracies between neutrino masses, the density of relativistic relics, and a possible time-varying equation of state of Dark Energy.

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“…Percival et al 2004;Davis et al 2011;Feix et al 2015;Huterer et al 2017;Adams & Blake 2017). Moreover, it has been shown that RSD provide a powerful probe to constrain the mass of relic cosmological neutrinos (Marulli et al 2011;Upadhye 2019) and the main parameters of interacting DE models (Marulli et al 2012a;Costa et al 2017), as well as helping in breaking the degeneracy between modified gravity and massive neutrino cosmologies (Moresco & Marulli 2017;Wright et al 2019;García-Farieta et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Validating the methodology for constraining the linear growth rate from clustering anisotropies

García-Farieta

Marulli

Moscardini

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Redshift-space clustering distortions provide one of the most powerful probes to test the gravity theory on the largest cosmological scales. In this paper we perform a systematic validation study of the state-of-the-art statistical methods currently used to constrain the linear growth rate from redshift-space distortions in the galaxy two-point correlation function. The numerical pipelines are tested on mock halo catalogues extracted from large N-body simulations of the standard cosmological framework, in the redshift range 0.5 z 2. We consider both the monopole and quadrupole multipole moments of the redshift-space two-point correlation function, as well as the radial and transverse clustering wedges, in the comoving scale range 10 < r[h −1 Mpc] < 55. Moreover, we investigate the impact of redshift measurement errors, up to δz ∼ 0.5%, which introduce spurious clustering anisotropies. We quantify the systematic uncertainties on the growth rate and linear bias measurements due to the assumptions in the redshiftspace distortion model. Considering both the dispersion model and two widely-used models based on perturbation theory, that is the Scoccimarro (2004) model and the Taruya et al. (2010) model, we find that the linear growth rate is underestimated by about 5 − 10% at z < 1, while limiting the analysis at larger scales, r > 30 h −1 Mpc, the discrepancy is reduced below 5%. At higher redshifts, we find instead an overall good agreement between measurements and model predictions. The Taruya et al. (2010) model is the one which performs better, with growth rate uncertainties below about 3%. The effect of redshift errors is degenerate with the one of small-scale random motions, and can be marginalised over in the statistical analysis, not introducing any statistically significant bias in the linear growth constraints, especially at z ≥ 1.

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Clustering and redshift-space distortions in modified gravity models with massive neutrinos

Cited by 24 publications

References 114 publications

Investigating the degeneracy between modified gravity and massive neutrinos with redshift-space distortions

Investigating the degeneracy between modified gravity and massive neutrinos with redshift-space distortions

The promising future of a robust cosmological neutrino mass measurement

Validating the methodology for constraining the linear growth rate from clustering anisotropies

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