A search for sterile neutrinos with the latest cosmological observations

Lü, Feng; Zhang, Jingfei; Zhang, Xin

doi:10.1140/epjc/s10052-017-4986-3

Cited by 58 publications

(46 citation statements)

References 115 publications

(108 reference statements)

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“…Besides, the positive correlation between the Hubble-Lemaître parameter and the interaction parameter, α, seems to indicate a possibility to relax the H 0 tension even more at the cost of assuming an energy flux from matter to dark energy (α > 0). When N eff is a free parameter of the model, the allowed interval of values shows a good agreement with previous ΛCDM analyses [6,73]. An important aspect worth mentioning is that the Λ(t)CDM + A l + N eff model allows at the same time for lower values of σ 8 and slightly higher values of H 0 with respect to the standard model and, therefore, offers a possibility to alleviate the H 0 -σ 8 tension discussed earlier (see eg.…”

Section: Analysis and Resultssupporting

confidence: 86%

Looking for interactions in the cosmological dark sector

Benetti

Miranda

Borges

et al. 2019

J. Cosmol. Astropart. Phys.

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We study observational signatures of non-gravitational interactions between the dark components of the cosmic fluid, which can be either due to creation of dark particles from the expanding vacuum or an effect of the clustering of a dynamical dark energy. In particular, we analyse a class of interacting models (Λ(t)CDM), characterised by the parameter α, that behaves at background level like cold matter at early times and tends to a cosmological constant in the asymptotic future. In our analysis we consider both background and primordial perturbations evolutions of the model. We use Cosmic Microwave Background (CMB) data together with late time observations, such as the Joint Light-curve Analysis (JLA) supernovae data, the Hubble Space Telescope (HST) measurement of the local value of the Hubble-Lemaître parameter, and primordial deuterium abundance from Lyα systems to test the observational viability of the model and some of its extensions. We found that there is no preference for values of α different from zero (characterising interaction), even if there are some indications for positive values when the minimal Λ(t)CDM model is analysed. When extra degrees of freedom in the relativistic component of the cosmic fluid are considered, the data favour negative values of α, which means an energy flux from dark energy to dark matter. * When non-linear scales are included, one finds Ωm0 ≈ 0.29 [36,37].

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Section: Analysis and Resultssupporting

confidence: 86%

Looking for interactions in the cosmological dark sector

Benetti

Miranda

Borges

et al. 2019

J. Cosmol. Astropart. Phys.

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“…Since g * s (T dec ν ) = (11/2) + (7/4)N ν = 10.75, we need to compute the decoupling temperature T dec N to obtain g * s (T dec N ) and hence N eff . For 0.05 < ∼ N eff < ∼ 0.38 [139] we find 101 > ∼ g * s (T dec N ) > ∼ 22 and also T dec N ≃ 165 MeV to obtain g * s (T dec N ) ≃ 30 (which gives N eff = 0.25). To estimate T dec N , we compute the annihilation rate Ŵ N (T) of N ′ 1 at T, which is given by…”

Section: Dark Radiationmentioning

confidence: 68%

“…It has been recently suggested [131][132][133][134][135][136][137][138][139] that these tensions can be alleviated if the number N eff of the relativistic species in the young Universe is slightly larger than the standard value 3.046 and the mass of the extra relativistic specie is of O(0.1) eV [139]. Here we suggest a radiative generation mechanism of the neutrino mass, which is directly connected to the existence of a stable DM particle and also a non-zero N eff = N eff − 3.046.…”

Section: Model Bmentioning

confidence: 99%

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Multicomponent Dark Matter in Radiative Seesaw Models

2017

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We discuss radiative seesaw models, in which an exact Z 2 × Z ′ 2 symmetry is imposed. Due to the exact Z 2 × Z ′ 2 symmetry, neutrino masses are generated at a two-loop level and at least two extra stable electrically neutral particles are predicted. We consider two models: one has a multi-component dark matter system and the other one has a dark radiation in addition to a dark matter. In the multi-component dark matter system, non-standard dark matter annihilation processes exist. We find that they play important roles in determining the relic abundance and also responsible for the monochromatic neutrino lines resulting from the dark matter annihilation process. In the model with the dark radiation, the structure of the Yukawa coupling is considerably constrained and gives an interesting relationship among cosmology, lepton flavor violating decay of the charged leptons and the decay of the inert Higgs bosons.

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“…In recent years, a series of studies have revealed that the properties of dark energy actually play an important role in cosmological measurement of neutrino mass . Moreover, the properties of dark energy also influence the cosmological search for sterile neutrinos [31][32][33][34][35][36]. It should also be mentioned that recent research has shown that the 10-year observation of gravitational-wave standard sirens from the Einstein Telescope (ET) can help improve the constraints on the total neutrino mass by about 10% [37] (see also Refs.…”

Section: Introductionmentioning

confidence: 99%

Forecast for weighing neutrinos in cosmology with SKA

Zhang

Wang

Zhang

2020

Sci. China Phys. Mech. Astron.

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We investigate what role the SKA neutral hydrogen sky survey observation will play in weighing neutrinos in cosmology. We use the simulated data of the baryon acoustic oscillation (BAO) measurements from the neutral hydrogen survey based on SKA1 and SKA2 to do the analysis. For the current observations, we use the Planck 2015 cosmic microwave background (CMB) anisotropies observation, the BAO measurements, the type Ia supernovae (SN) observation (Pantheon compilation), and the latest H0 measurement. We consider three mass ordering cases for massive neutrinos, i.e., the normal hierarchy (NH), inverted hierarchy (IH), and degenerate hierarchy (DH) cases. It is found that the SKA observation can significantly improve the constraints on Ωm and H0. Compared to the current observation, the SKA1 data can improve the constraints on Ωm by about 33%, and on H0 by about 36%; the SKA2 data can improve the constraints on Ωm by about 58%, and on H0 by about 66%. It is also found that the SKA observation can only slightly improve the constraints on mν . Compared to the current observation, the SKA1 data can improve the constraints on mν by about 4%, 3%, and 10%, for the NH, IH, and DH cases, respectively; the SKA2 data can improve the constraints on mν by about 7%, 7%, and 16%, for the NH, IH, and DH cases, respectively.

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A search for sterile neutrinos with the latest cosmological observations

Cited by 58 publications

References 115 publications

Looking for interactions in the cosmological dark sector

Looking for interactions in the cosmological dark sector

Multicomponent Dark Matter in Radiative Seesaw Models

Forecast for weighing neutrinos in cosmology with SKA

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