A fresh look at keV sterile neutrino dark matter from frozen-in scalars

Adulpravitchai, Adisorn; Schmidt, Michael A.

doi:10.1007/jhep01(2015)006

Cited by 50 publications

(81 citation statements)

References 106 publications

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“…This is justified by kinematical arguments and by the low 36 For detailed comments on this assumption, see [676,730] and references therein. 37 For the case of mS < vEW studies on the level of particle number densitites can be found in [683].…”

Section: Necessary Approximationmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

380

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: Necessary Approximationmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

380

316

View full text Add to dashboard Cite

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“…2016;Merle & Schneider 2015), thereby strongly pushing such scenarios. Other settings, where sterile neutrinos are produced by decays of, e.g., scalar particles (see a few concrete examples in Shaposhnikov & Tkachev 2006;Kusenko 2006;Petraki & Kusenko 2008;Merle et al 2014;Merle & Totzauer 2015;Klasen & Yaguna 2013;Adulpravitchai & Schmidt 2015;Shakya 2016;König et al 2016), are largely unconstrained by present X-ray observations, since they could in principle operate even without active-sterile mixing. Note that the corresponding parent in such Scalar Decay (SD) models must themselves be coupled to the Standard Model, typically via the Higgs sector.…”

Section: Introductionmentioning

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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“…From the observed fluxes, and with the assumption that the sterile neutrinos constitute all of the dark matter, the inferred best-fit vacuum mixing angles are sin 2 2θ v ≈ 7 × 10 −11 . While the existence of this line in terms of statistical significance, as well as its interpretation as having a dark matter origin are still up for debate [83][84][85][86][87][88][89][90][91][92][93][94], the possibility remains intriguing, and various sterile neutrino dark matter models can have their parameters tailored to fit this particular scenario [29,30,[32][33][34][35][36]38]. Future Xray telescopes such as ASTRO-H and ATHENA, as well as microcalorimeter sounding rocket experiments such as Micro-X [95,96], with their high energy resolution, could help settle the verdict on this case one way or the other [97].…”

Section: The 355 Kev X-ray Linementioning

confidence: 99%

Diluted equilibrium sterile neutrino dark matter

et al. 2015

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We present a model where sterile neutrinos with rest-masses in the range ∼ keV to ∼ MeV can be the dark matter and be consistent with all laboratory, cosmological, large scale structure, and X-ray constraints. These sterile neutrinos are assumed to freeze out of thermal and chemical equilibrium with matter and radiation in the very early universe, prior to an epoch of prodigious entropy generation ("dilution") from out-of-equilibrium decay of heavy particles. In this work, we consider heavy, entropy-producing particles in the ∼ TeV to ∼ EeV rest-mass range, possibly associated with new physics at high energy scales. The process of dilution can give the sterile neutrinos the appropriate relic densities, but it also alters their energy spectra so that they could act like cold dark matter, despite relatively low rest-masses as compared to conventional dark matter candidates. Moreover, since the model does not rely on active-sterile mixing for producing the relic density, the mixing angles can be small enough to evade current X-ray/lifetime constraints. Nevertheless, we discuss how future X-ray observations, future lepton number constraints, and future observations and sophisticated simulations of large scale structure could, in conjunction, provide evidence for this model and/or constrain and probe its parameters.

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A fresh look at keV sterile neutrino dark matter from frozen-in scalars

Cited by 50 publications

References 106 publications

A White Paper on keV sterile neutrino Dark Matter

A White Paper on keV sterile neutrino Dark Matter

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

Diluted equilibrium sterile neutrino dark matter

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