The Role of Sterile Neutrinos in Cosmology and Astrophysics

Boyarsky, Alexey; Ruchayskiy, Oleg; Shaposhnikov, Mikhail

doi:10.1146/annurev.nucl.010909.083654

Cited by 612 publications

(694 citation statements)

References 161 publications

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“…be heavier than 0.4 keV, which is the bound obtained from a model independent analysis [119] and (ii) the active-sterile mixing needs to be small enough to satisfy the stringent constraint coming from different X-ray experiments [120].…”

Section: Jhep02(2015)124mentioning

confidence: 97%

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

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We perform a detailed study of the signal rate of the lightest Higgs boson in the diphoton channel (µ γγ ), recently analyzed by both the ATLAS and CMS collaborations at the Large Hadron Collider, in the framework of U(1) R − lepton number model with a right handed neutrino superfield. The corresponding neutrino Yukawa coupling, 'f ', plays a very important role in the phenomenology of this model. A large value of f ∼ O(1) provides an additional tree level contribution to the lightest Higgs boson mass along with a very light (mass ∼ a few hundred MeV) bino like neutralino and a small tree level mass of one of the active neutrinos that is compatible with various experimental results. In the presence of this light neutralino, the total decay width of the Higgs boson and its various branching fractions are affected. When studied in conjunction with the recent LHC results, these put significant constraints on the parameter space. The signal rate µ γγ obtained in this scenario is compatible with the recent results from both the ATLAS and the CMS collaborations at 1σ level. A small value of 'f ', on the other hand, is compatible with a sterile neutrino acting as a 7 keV dark matter that can explain the observation of a mono-energetic X-ray photon line by the XMM-Newton X-ray observatory. Because of the absence of a light neutralino, the total decay width of the lightest Higgs boson in this case remains close to the SM expectation. Hence, in the small 'f ' scenario we obtain a relatively larger value of µ γγ which is closer to the central values reported recently by these two collaborations.

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Section: Jhep02(2015)124mentioning

confidence: 97%

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

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“…The value of this quantity, which measures the excess of leptons over anti-leptons, affects the scale of free streaming in addition to the rest mass of the sterile neutrino. Asaka & Shaposhnikov (2005) proposed a model for the generation of the lepton asymmetry by introducing three right-handed sterile neutrinos in what is known as the 'Neutrino Minimal Standard Model' (νMSM, see also Boyarsky et al 2009b). In this model, a keV mass sterile neutrino (labelled N1) is partnered with two GeV mass sterile neutrinos (N2 and N3).…”

Section: The Sterile Neutrino Modelmentioning

confidence: 99%

“…In order simultaneously to account for the dark matter and flavour oscillations, at least three E-mail: sownak.bose@durham.ac.uk right-handed sterile neutrinos are needed (Asaka & Shaposhnikov 2005;Asaka et al 2007;Canetti et al 2013). In this 'Neutrino Minimal Standard Model' (or νMSM), two of the sterile neutrinos interact more strongly with the active neutrinos than the third, which behaves as dark matter (Boyarsky et al 2009b). With the appropriate choice of parameters in the Lagrangian, it is possible to obtain the correct dark matter density in sterile neutrinos.…”

Section: Introductionmentioning

confidence: 99%

Reionization in sterile neutrino cosmologies

Bose¹,

Frenk²,

Hou³

et al. 2016

Mon. Not. R. Astron. Soc.

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTWe investigate the process of reionisation in a model in which the dark matter is a warm elementary particle such as a sterile neutrino. We focus on models that are consistent with the dark matter decay interpretation of the recently detected line at 3.5 keV in the X-ray spectra of galaxies and clusters. In warm dark matter models the primordial spectrum of density perturbations has a cut-off on the scale of dwarf galaxies. Structure formation therefore begins later than in the standard cold dark matter (CDM) model and very few objects form below the cut-off mass scale. To calculate the number of ionising photons, we use the Durham semianalytic model of galaxy formation, GALFORM. We find that even the most extreme 7 keV sterile neutrino we consider is able to reionise the Universe early enough to be compatible with the bounds on the epoch of reionisation from Planck. This, perhaps surprising, result arises from the rapid build-up of high redshift galaxies in the sterile neutrino models which is also reflected in a faster evolution of their far-UV luminosity function between 10 > z > 7 than in CDM. The dominant sources of ionising photons are systematically more massive in the sterile neutrino models than in CDM. As a consistency check on the models, we calculate the present-day luminosity function of satellites of Milky Way-like galaxies. When the satellites recently discovered in the DES survey are taken into account, strong constraints are placed on viable sterile neutrino models.

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“…The extension of the SM spectrum by sterile neutrino states may even provide a solution to the third problem, since sterile neutrinos are a perfect dark matter candidate (see e.g. [25][26][27][28][29][30][31][32]). A further possible implication of sterile neutrinos is a modified active neutrino flux in reactor experiments [33].…”

Section: Introductionmentioning

confidence: 99%

Improving electro-weak fits with TeV-scale sterile neutrinos

Akhmedov

Kartavtsev

Lindner

et al. 2013

J. High Energ. Phys.

105

170

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We study the impact of TeV-scale sterile neutrinos on electro-weak precision observables and lepton number and flavour violating decays in the framework of a type-I see-saw extension of the Standard Model. At tree level sterile neutrinos manifest themselves via non-unitarity of the PMNS matrix and at one-loop level they modify the oblique radiative corrections. We derive explicit formulae for the S, T, U parameters in terms of the neutrino masses and mixings and perform a numerical fit to the electro-weak observables. We find regions of parameter space with a sizable active-sterile mixing which provide a better over-all fit compared to the case where the mixing is negligible. Specifically we find improvements of the invisible Z-decay width, the charged-to-neutralcurrent ratio for neutrino scattering experiments and of the deviation of the W boson mass from the theoretical expectation.

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The Role of Sterile Neutrinos in Cosmology and Astrophysics

Cited by 612 publications

References 161 publications

h → γγ in U(1) R -lepton number model with a right-handed neutrino

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Reionization in sterile neutrino cosmologies

Improving electro-weak fits with TeV-scale sterile neutrinos

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