Reactor sterile neutrinos, dark energy, and the age of the universe

Kristiansen, Jørn; Elgarøy, Ø.

doi:10.1051/0004-6361/201117025

Cited by 6 publications

(7 citation statements)

References 36 publications

(58 reference statements)

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“…Therefore, we conclude that masses of light sterile neutrinos, which may explain current results of short baselines neutrino oscillation searches are not in good agreement with our constraints. In order to reconcile neutrino masses near 1 eV with the constraints on total neutrino mass from cosmological data it was suggested to consider the cosmological models with dark energy more general than cosmological constant (Kristiansen, Elgaroy, 2011;Hamann et al, 2011). It was found that with dark energy equation of state parameter w < −1 the limits on neutrino mass are relaxed considerably.…”

Section: Light Sterile Neutrinosmentioning

confidence: 99%

“…In order to reconcile neutrino masses near 1 eV with the constraints on total neutrino mass from cosmological data it was suggested to consider the cosmological models with dark energy more general than cosmological constant (Kristiansen, Elgaroy, 2011;Hamann et al, 2011). It was found that with dark energy equation of state parameter w < −1 the limits on neutrino mass are relaxed considerably.…”

Section: Light Sterile Neutrinosmentioning

confidence: 99%

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Cosmological parameters constraints from galaxy cluster mass function measurements in combination with other cosmological data

Burenin

Vikhlinin

2012

Astron. Lett.

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-We present the cosmological parameters constraints obtained from the combination of galaxy cluster mass function measurements (Vikhlinin et al., 2009a,b) with new cosmological data obtained during last three years: updated measurements of cosmic microwave background anisotropy with Wilkinson Microwave Anisotropy Probe (WMAP) observatory, and at smaller angular scales with South Pole Telescope (SPT), new Hubble constant measurements, baryon acoustic oscillations and supernovae Type Ia observations. New constraints on total neutrino mass and effective number of neutrino species are obtained. In models with free number of massive neutrinos the constraints on these parameters are notably less strong, and all considered cosmological data are consistent with non-zero total neutrino mass Σmν ≈ 0.4 eV and larger than standard effective number of neutrino species, Neff ≈ 4. These constraints are compared to the results of neutrino oscillations searches at short baselines. The updated dark energy equation of state parameters constraints are presented. We show that taking in account systematic uncertainties, current cluster mass function data provide similarly powerful constraints on dark energy equation of state, as compared to the constraints from supernovae Type Ia observations.

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Section: Light Sterile Neutrinosmentioning

confidence: 99%

Section: Light Sterile Neutrinosmentioning

confidence: 99%

Cosmological parameters constraints from galaxy cluster mass function measurements in combination with other cosmological data

Burenin

Vikhlinin

2012

Astron. Lett.

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“…It has also been pointed out that an eV-scale sterile neutrino would significantly affect the the atmospheric neutrino fluxes in the energy range 500 GeV to a few TeV, and these effects could be studied in the IceCube detector [16][17][18]. Other aspects that are in principle modified by such sterile states are supernova physics [19], solar neutrinos [20], or the interpretation of cosmological data [21]. We will add to this discussion by updating the predictions for 0νββ with the recent results for the relevant mixing parameters.…”

Section: Introductionmentioning

confidence: 99%

Light sterile neutrinos: models and phenomenology

Barry

Rodejohann

Zhang

2011

J. High Energ. Phys.

192

257

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Motivated by recent hints in particle physics and cosmology, we study the realization of eV-scale sterile neutrinos within both the seesaw mechanism and flavor symmetry theories. We show that light sterile neutrinos can rather easily be accommodated in the popular A 4 flavor symmetry models. The exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing, which we discuss in detail for one example. In addition, we find an interesting extension of the type I seesaw, which can provide a natural origin for eV-scale sterile neutrinos as well as visible admixtures between sterile and active neutrinos. We also show that the presence of sterile neutrinos would significantly change the observables in neutrino experiments, specifically the oscillation probabilities in short-baseline experiments and the effective mass in neutrino-less double beta decay. The latter can prove particularly helpful in strengthening the case for eV-scale sterile neutrinos.

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“…They estimated a range of [11 − 16] Gyr to the age of the universe. Kristiansen and Elgaroy [45] used a combination of cosmic microwave background (CMB), large scale structure (LSS), and SNe Ia data to get a lower limit of 12.58 ± 0.26 Gyr to the expansion age of the universe. In this context, we'll use the recent data for the age of the universe to constrain the last parameter in our model.…”

Section: Age Of the Universementioning

confidence: 99%

Dissipative unified dark fluid model

El-khateeb

2019

Int. J. Mod. Phys. D

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We consider a unified dissipative dark fluid model. Our fluid contains an adiabatic part plus a bulk viscous one. The adiabatic part has the ability to asymptote between two power laws and so can interpolate between the dust and dark energy equations of state at early and late times. The dissipative part is a bulk viscous part with constant viscosity coefficient. The model is analyzed using the phase space methodology which helps to understand the dynamical behavior of the model in a robust manner without reference to the system solution. The parameters of the model are constrained through its asymptotic behavior and also through many observational constraints. We solve the Hubble parameter equation using numerical methods and results are plotted against the newest set of Hubble data. The model is tested using the Om(z) test which shows that this model although is a quintessence-like model, it slides through the phantom barrier. We study the model expectations for the evolution of the universe by studying the evolution of the deceleration parameter, the density of the universe, the effective equation of state parameter of the model and of its underlying dark energy package. We estimate the value of the present day viscosity coefficient of the cosmic fluid as 8 × 10 6 P a.s, which agrees with the work of many authors, e.g., Velten and Schwartz [26], Wang and Meng [27], and Sasidharan and Mathew [29]. We argue that this model is able to explain the behavior of the universe evolution.

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Reactor sterile neutrinos, dark energy, and the age of the universe

Cited by 6 publications

References 36 publications

Cosmological parameters constraints from galaxy cluster mass function measurements in combination with other cosmological data

Cosmological parameters constraints from galaxy cluster mass function measurements in combination with other cosmological data

Light sterile neutrinos: models and phenomenology

Dissipative unified dark fluid model

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