Sterile neutrinos

Dasgupta, Basudeb; Kopp, Joachim

doi:10.1016/j.physrep.2021.06.002

Cited by 165 publications

(145 citation statements)

References 399 publications

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“…We will derive an explicit relation between the NEDE parameters and m s , showing that this mechanism can be naturally embedded in a supercooled phase transition. We also discuss the possibility that a fourth neutrino mass eigenstate ν 4 , which has been claimed to resolve shortbaseline oscillation anomalies [71][72][73], is present in the low-energy mass spectrum. Our NEDE scalar, which gives mass to ν 4 (and the active neutrino eigenstates), is then also responsible for the "secret interaction" needed to make the presence of ν 4 compatible with cosmology [74][75][76][77][78].…”

Section: Referencesmentioning

confidence: 99%

New early dark energy

2021

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New measurements of the expansion rate of the Universe have plunged the standard model of cosmology into a severe crisis. In this paper, we propose a simple resolution to the problem that relies on a first order phase transition in a dark sector in the early Universe, before recombination. This will lead to a short phase of a new early dark energy (NEDE) component and can explain the observations. We model the false vacuum decay of the NEDE scalar field as a sudden transition from a cosmological constant source to a decaying fluid with constant equation of state. The corresponding fluid perturbations are covariantly matched to the adiabatic fluctuations of a subdominant scalar field that triggers the phase transition. Fitting our model to measurements of the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO, and supernovae (SNe) yields a significant improvement of the best fit compared with the standard cosmological model without NEDE. We find the mean value of the present Hubble parameter in the NEDE model to be H 0 ¼ 71.4 AE 1.0 km s −1 Mpc −1 (68% C.L.).

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Section: Referencesmentioning

confidence: 99%

New early dark energy

2021

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“…From this viewpoint, probing the existence of light sterile neutrinos is extremely interesting. Depending on the mass and mixing parameters characterizing the light sterile states, there can be stringent restrictions following from laboratory, astrophysical and cosmological observations [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…This value is allowed by the recent analyses of COHERENT-CsI[55] and COHERENT-LAr[63] 9. Only νµ → νs transitions are assumed for the analysis of COHERENT data.…”

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confidence: 99%

Low-energy probes of sterile neutrino transition magnetic moments

Miranda

Papoulias

Sanders

et al. 2021

J. High Energ. Phys.

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Sterile neutrinos with keV-MeV masses and non-zero transition magnetic moments can be probed through low-energy nuclear or electron recoil measurements. Here we determine the sensitivities of current and future searches, showing how they can probe a previously unexplored parameter region. Future coherent elastic neutrino-nucleus scattering (CEνNS) or elastic neutrino-electron scattering (EνES) experiments using a monochromatic 51Cr source can fully probe the region indicated by the recent XENON1T excess.

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“…A more detailed review on the status of light sterile neutrinos can be found in Refs. [32][33][34][35].…”

Section: Neutrino Anomaliesmentioning

confidence: 99%

Sterile Neutrinos with Neutrino Telescopes

Argüelles

Salvadó

2021

Universe

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Searches for light sterile neutrinos are motivated by the unexpected observation of an electron neutrino appearance in short-baseline experiments, such as the Liquid Scintillator Neutrino Detector (LSND) and the Mini Booster Neutrino Experiment (MiniBooNE). In light of these unexpected results, a campaign using natural and anthropogenic sources to find the light (mass-squared-difference around 1 eV2) sterile neutrinos is underway. Among the natural sources, atmospheric neutrinos provide a unique gateway to search for sterile neutrinos due to the broad range of baseline-to-energy ratios, L/E, and the presence of significant matter effects. Since the atmospheric neutrino flux rapidly falls with energy, studying its highest energy component requires gigaton-scale neutrino detectors. These detectors—often known as neutrino telescopes since they are designed to observe tiny astrophysical neutrino fluxes—have been used to perform searches for light sterile neutrinos, and researchers have found no significant signal to date. This brief review summarizes the current status of searches for light sterile neutrinos with neutrino telescopes deployed in solid and liquid water.

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Sterile neutrinos

Cited by 165 publications

References 399 publications

New early dark energy

New early dark energy

Low-energy probes of sterile neutrino transition magnetic moments

Sterile Neutrinos with Neutrino Telescopes

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