On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos

Cataneo, Matteo; Emberson, J. D.; Inman, Derek; Harnois-Déraps, Joachim; Heymans, Catherine

doi:10.1093/mnras/stz3189

Cited by 30 publications

(37 citation statements)

References 64 publications

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“…This is sufficient for modelling the mildly non-linear regime, where the baryonic acoustic oscillation peak is located, but these techniques cannot be used to predict the signal in the highly non-linear regime that WL analyses will probe. The reaction method, however, can in principle achieve an accuracy of ≈1% up to scales k 10 h Mpc −1 when using the results of an emulator as a baseline (Giblin et al 2019;Cataneo et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear

Martinelli

Tutusaus

Archidiacono

et al. 2021

A&A

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Upcoming surveys will map the growth of large-scale structure with unprecented precision, improving our understanding of the dark sector of the Universe. Unfortunately, much of the cosmological information is encoded on small scales, where the clustering of dark matter and the effects of astrophysical feedback processes are not fully understood. This can bias the estimates of cosmological parameters, which we study here for a joint analysis of mock Euclid cosmic shear and Planck cosmic microwave background data. We use different implementations for the modelling of the signal on small scales and find that they result in significantly different predictions. Moreover, the different non-linear corrections lead to biased parameter estimates, especially when the analysis is extended into the highly non-linear regime, with the Hubble constant, H0, and the clustering amplitude, σ8, affected the most. Improvements in the modelling of non-linear scales will therefore be needed if we are to resolve the current tension with more and better data. For a given prescription for the non-linear power spectrum, using different corrections for baryon physics does not significantly impact the precision of Euclid, but neglecting these correction does lead to large biases in the cosmological parameters. In order to extract precise and unbiased constraints on cosmological parameters from Euclid cosmic shear data, it is therefore essential to improve the accuracy of the recipes that account for non-linear structure formation, as well as the modelling of the impact of astrophysical processes that redistribute the baryons.

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Section: Introductionmentioning

confidence: 99%

Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear

Martinelli

Tutusaus

Archidiacono

et al. 2021

A&A

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“…Further worth noting is that an extension of the current framework has also been developed to include massive neutrinos (Cataneo et al 2020;Wright et al 2019) and its implementation into ReACT will be the focus of an upcoming work. We also look to extend the current code to galaxy clustering observables, namely the redshift space power spectrum for biased tracers.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper we have combined the halo model reaction for modified gravity and non-constant dark energy (Cataneo et al 2019) with the halo model reaction for massive neutrinos (Cataneo et al 2020). Top is = 0 and bottom is = 1.…”

Section: Discussionmentioning

confidence: 99%

“…Our goal is to precisely model the non-linear power spectrum in cosmologies that include both massive neutrinos and modifications to ΛCDM. To do this we combine the halo model reaction for beyond-ΛCDM cosmologies (Cataneo et al 2019) with that for massive neutrinos (Cataneo et al 2020).…”

Section: Extended Halo Model Reactionmentioning

confidence: 99%

“…In this paper, we present an extension to the framework of Cataneo et al (2019) (C19) to include the effects of massive neutrinos as modelled in Cataneo et al (2020), i.e. consistently combining the beyond-ΛCDM and massive neutrino halo model reactions.…”

Section: Introductionmentioning

confidence: 99%

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On the road to per cent accuracy IV: ReACT – computing the non-linear power spectrum beyond ΛCDM

Bose

Cataneo

Tröster

et al. 2020

Monthly Notices of the Royal Astronomical Society

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To effectively exploit large-scale structure surveys, we depend on accurate and reliable predictions of non-linear cosmological structure formation. Tools for efficient and comprehensive computational modelling are therefore essential to perform cosmological parameter inference analyses. We present the public software package ReACT, demonstrating its capability for the fast and accurate calculation of non-linear power spectra from non-standard physics. We showcase ReACT through a series of analyses on the DGP and f(R) gravity models, adopting LSST-like cosmic shear power spectra. Accurate non-linear modelling with ReACT has the potential to more than double LSST’s constraining power on the f(R) parameter, in contrast to an analysis that is limited to the quasi-linear regime. We find that ReACT is sufficiently robust for the inference of consistent constraints on theories beyond ΛCDM for current and ongoing surveys. With further improvement, particularly in terms of the accuracy of the non-linear ΛCDM power spectrum, ReACT can, in principle, meet the accuracy requirements for future surveys such as Euclid and LSST.

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Cosmology in the non-linear regime: the small scale miracle

Lacasa

2022

A&A

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Interest is rising in exploiting the full shape information of the galaxy power spectrum, and in pushing analyses to smaller non-linear scales. Here I use the halo model to quantify the information content in the tomographic angular power spectrum of galaxies Cℓgal(iz) for the future high-resolution surveys Euclid and SKA2. I study how this information varies as a function of the scale cut applied, either with angular cut ℓmax or physical cut kmax. For this, I use analytical covariances with the most complete census of non-Gaussian terms, which proves to be critical. I find that the Fisher information on most cosmological and astrophysical parameters shows a striking behaviour. Beyond the perturbative regime, we first get decreasing returns: the information continues to rise but the slope slows down until reaching saturation. The location of this plateau, at k ∼ 2 Mpc−1, is slightly beyond the reach of current modelling methods and depends to some extent on the parameter and redshift bin considered. I explain the origin of this plateau, which is due to non-linear effects both on the power spectrum, and more importantly on non-Gaussian covariance terms. Then, pushing further, we see the information rising again in the highly non-linear regime, with a steep slope. This is the small-scale miracle, for which I give my interpretation and discuss the properties. There are suggestions that it may be possible to disentangle this information from the astrophysical content, and improve dark energy constraints. Finally, more hints are shown that high-order statistics may yield significant improvements over the power spectrum in this regime, with the improvements increasing with kmax.

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On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos

Cited by 30 publications

References 64 publications

Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear

Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear

On the road to per cent accuracy IV: ReACT – computing the non-linear power spectrum beyond ΛCDM

Cosmology in the non-linear regime: the small scale miracle

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