Cosmology with massive neutrinos II: on the universality of the halo mass function and bias

Castorina, Emanuele; Sefusatti, Emiliano; Sheth, Ravi K.; Villaescusa-Navarro, Francisco; Viel, Matteo

doi:10.1088/1475-7516/2014/02/049

Cited by 202 publications

(267 citation statements)

References 85 publications

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“…In any case the exact functional form of the bias function, the range of scales considered, as well as prior assumptions on the bias parameters, are delicate issues that should be treated carefully. An additional complication arises from the fact that massive neutrinos themselves induce a scale-dependent feature in the bias parameter, due to the scaledependent growth of structures in cosmologies with massive neutrinos [67,68]. It has to be mentioned that, at any given redshift, there exists a certain scale k NL below which the density contrast approaches the limit δ ∼ 1.…”

Section: Clusteringmentioning

confidence: 99%

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

2018

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Cosmological observations are a powerful probe of neutrino properties, and in particular of their mass. In this review, we first discuss the role of neutrinos in shaping the cosmological evolution at both the background and perturbation level, and describe their effects on cosmological observables such as the cosmic microwave background and the distribution of matter at large scale. We then present the state of the art concerning the constraints on neutrino masses from those observables, and also review the prospects for future experiments. We also briefly discuss the prospects for determining the neutrino hierarchy from cosmology, the complementarity with laboratory experiments, and the constraints on neutrino properties beyond their mass.

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Section: Clusteringmentioning

confidence: 99%

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

2018

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“…We also investigate the well known degeneracy between Ω ν and σ 8 [46,56,59]. For instance, the effects of massive neutrinos in many observables such as cluster number counts, can be mimicked by a cosmology with massless neutrinos but with a lower value of σ 8 , which is the r.m.s.…”

Section: ω ν -σ 8 Degeneracymentioning

confidence: 99%

Voids in massive neutrino cosmologies

Massara

Villaescusa-Navarro

Viel

et al. 2015

J. Cosmol. Astropart. Phys.

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134

159

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Abstract. Cosmic voids are a promising environment to characterize neutrino-induced effects on the large-scale distribution of matter in the universe. We perform a comprehensive numerical study of the statistical properties of voids, identified both in the matter and galaxy distributions, in massive and massless neutrino cosmologies. The matter density field is obtained by running several independent N -body simulations with cold dark matter and neutrino particles, while the galaxy catalogs are modeled by populating the dark matter halos in simulations via a halo occupation distribution (HOD) model to reproduce the clustering properties observed by the Sloan Digital Sky Survey (SDSS) II Data Release 7. We focus on the impact of massive neutrinos on the following void statistical properties: number density, ellipticities, two-point statistics, density and velocity profiles. Considering the matter density field, we find that voids in massive neutrino cosmologies are less evolved than those in the corresponding massless neutrinos case: there is a larger number of small voids and a smaller number of large ones, their profiles are less evacuated, and they present a lower wall at the edge. Moreover, the degeneracy between σ 8 and Ω ν is broken when looking at void properties. In terms of the galaxy density field, we find that differences among cosmologies are difficult to detect because of the small number of galaxy voids in the simulations. Differences are instead present when looking at the matter density and velocity profiles around these voids.

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“…Grossi et al 2007;Wagner et al 2010), massive neutrinos (see e.g. Castorina et al 2013) and Warm Dark Matter (see e.g. Angulo et al 2013) models, all affect the halo mass function with a specific mass dependence -in most cases having a stronger impact on the highmass tail -the effect of the DE-CDM scattering appears to have a very weak dependence on the halo mass resulting in a roughly constant enhancement (or suppression) of the halo abundance over a wide mass range, at least at low redshifts.…”

Section: The Halo Mass Functionmentioning

confidence: 99%

Simulating momentum exchange in the dark sector

Baldi

Simpson

2015

Monthly Notices of the Royal Astronomical Society

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Low energy interactions between particles are often characterised by elastic scattering. Just as electrons undergo Thomson scattering with photons, dark matter particles may experience an analogous form of momentum exchange with dark energy. We investigate the influence such an interaction has on the formation of linear and nonlinear cosmic structure, by running for the first time a suite of N-body simulations with different dark energy equations of state and scattering cross sections. In models where the linear matter power spectrum is suppressed by the scattering, we find that on nonlinear scales the power spectrum is strongly enhanced. This is due to the friction term increasing the efficiency of gravitational collapse, which also leads to a scale-independent amplification of the concentration and mass functions of halos. The opposite trend is found for models characterised by an increase of the linear matter power spectrum normalisation. More quantitatively, we find that power spectrum deviations at nonlinear scales (k ≈ 10 h/Mpc) are roughly ten times larger than their linear counterparts, exceeding 100% for the largest value of the scattering cross section considered in the present work. Similarly, the concentration-mass relation and the halo mass function show deviations up to 100% and 20%, respectively, over a wide range of masses. Therefore, we conclude that nonlinear probes of structure formation might provide much tighter constraints on the scattering cross section between dark energy and dark matter as compared to the present bounds based on linear observables.

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Cosmology with massive neutrinos II: on the universality of the halo mass function and bias

Cited by 202 publications

References 85 publications

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

Voids in massive neutrino cosmologies

Simulating momentum exchange in the dark sector

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