Lepton-number-driven sterile neutrino production in the early universe

Kishimoto, Chad T.; Fuller, George M.

doi:10.1103/physrevd.78.023524

Cited by 43 publications

(49 citation statements)

References 53 publications

(99 reference statements)

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“…At low enough temperature, a combination of non-adiabaticity or cessation of resonances, plus a reduced active neutrino scattering rate, imply that production of sterile neutrino relic density ceases. In the end, the relic density of sterile neutrinos, and the relic energy spectrum of these, will then be the result of a sometimes complicated nonlinear interplay of the histories of active neutrino scattering rates and in-medium active-sterile mixing angle θ m (t) [668].…”

Section: Msw-effect and Resonant Conversionmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

373

316

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Abstract. We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved -cosmology, astrophysics, nuclear, and particle physics -in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos.

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Section: Msw-effect and Resonant Conversionmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

373

316

View full text Add to dashboard Cite

show abstract

“…For the case of collisional dominated neutrino interactions, the production of sterile singlets can be written in terms of the Boltzmann equation [27][28][29] …”

Section: Resonant Sterile Neutrino Productionmentioning

confidence: 99%

Astrophysical constraints on resonantly produced sterile neutrino dark matter

Schneider

2016

J. Cosmol. Astropart. Phys.

122

160

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Resonantly produced sterile neutrinos are considered an attractive dark matter (DM) candidate only requiring a minimal, well motivated extension to the standard model of particle physics. With a particle mass restricted to the keV range, sterile neutrinos are furthermore a prime candidate for warm DM, characterised by suppressed matter perturbations at the smallest observable scales. In this paper we take a critical look at the validity of the resonant scenario in the context of constraints from structure formation. We compare predicted and observed number of Milky-Way satellites and we introduce a new method to generalise existing Lyman-α limits based on thermal relic warm DM to the case of resonant sterile neutrino DM. The tightest limits come from the Lyman-α analysis, excluding the entire parameter space (at 2-σ confidence level) still allowed by X-ray observations. Constraints from Milky-Way satellite counts are less stringent, leaving room for resonant sterile neutrino DM most notably around the suggested line signal at 7.1 keV. *

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“…In this work the sterile neutrino momentum distributions of RP are computed with the public code sterile-dm of Venumadhav et al (2016), which is an extension of earlier works (Abazajian et al 2001;Kishimoto & Fuller 2008;Abazajian 2014). The computation is based on the Boltzmann equation and includes detailed calculations of the lepton asymmetry around the quark-hadron transition.…”

Section: 2mentioning

confidence: 99%

Fundamental Physics with the Hubble Frontier Fields: Constraining Dark Matter Models with the Abundance of Extremely Faint and Distant Galaxies

Menci

Merle

Totzauer

et al. 2017

ApJ

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We show that the measured abundance of ultra-faint lensed galaxies at z ≈ 6 in the Hubble Frontier Fields (HFF) provides stringent constraints on the parameter space of i) Dark Matter models based on keV sterile neutrinos; ii) the "fuzzy" wavelike Dark Matter models, based on Bose-Einstein condensate of ultra-light particles. For the case of the sterile neutrinos, we consider two production mechanisms: resonant production through the mixing with active neutrinos and the decay of scalar particles. For the former model, we derive constraints for the combination of sterile neutrino mass m ν and mixing parameter sin 2 (2θ) which provide the tightest lower bounds on the mixing angle (and hence on the lepton asymmetry) derived so far by methods independent of baryonic physics. For the latter we compute the allowed combinations of the scalar mass, its coupling to the Higgs field, and the Yukawa coupling of the scalar to the sterile neutrinos. We compare our results to independent, existing astrophysical bounds on sterile neutrinos in the same mass range. For the case of "fuzzy" Dark Matter, we show that the observed number density ≈ 1/Mpc 3 of high-redshift galaxies in the HFF sets a lower limit m ψ ≥ 8 · 10 −22 eV (at 3-σ confidence level) on the particle mass, a result that strongly disfavors wavelike bosonic Dark Matter as a viable model for structure formation. We discuss the impact on our results of uncertainties due to systematics in the selection of highly magnified, faint galaxies at high redshifts.

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Lepton-number-driven sterile neutrino production in the early universe

Cited by 43 publications

References 53 publications

A White Paper on keV sterile neutrino Dark Matter

A White Paper on keV sterile neutrino Dark Matter

Astrophysical constraints on resonantly produced sterile neutrino dark matter

Fundamental Physics with the Hubble Frontier Fields: Constraining Dark Matter Models with the Abundance of Extremely Faint and Distant Galaxies

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