Sterile Neutrino/Dark Fermion Dark Matter: Searches in the X-Ray Sky, the Nuclear Physics Laboratory and in Galaxy Formation

2019 ◽  
pp. 1-8
Author(s):  
Kevork N. Abazajian
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Nuclear Physics ◽  
Sterile Neutrino ◽  
X Ray ◽  
Physics Laboratory

PULSAR KICKS AND DARK MATTER FROM A STERILE NEUTRINO

2005 ◽  
Vol 20 (06) ◽  
pp. 1148-1154 ◽  
Author(s):  
ALEXANDER KUSENKO
Keyword(s):  
Dark Matter ◽  
Neutron Star ◽  
Gravitational Wave ◽  
Sterile Neutrino ◽  
Supernova Explosion ◽  
Radio Pulsars ◽  
X Ray ◽  
Gravitational Wave Detectors ◽  
Rule Out

The observed velocities of radio pulsars, which range in the hundreds kilometers per second, and many of which exceed 1000 km/s, are not explained by the standard physics of the supernova explosion. However, if a sterile neutrino with mass in the 1–20 keV range exists, it would be emitted asymmetrically from a cooling neutron star, which could give it a sufficient recoil to explain the pulsar motions. The same particle can be the cosmological dark mater. Future observations of X-ray telescopes and gravitational wave detectors can confirm or rule out this explanation.

Galaxy formation in semi-analytic models with sterile neutrino dark matter

2017 ◽  
Author(s):  
M. R. Lovell ◽  
S. Bose ◽  
A. Boyarsky ◽  
S. Cole ◽  
C. Frenk ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Sterile Neutrino ◽  
Analytic Models

scholarly journals 7.1 keV sterile neutrino dark matter constraints from a deep Chandra X-ray observation of the Galactic bulge Limiting Window

2019 ◽  
Vol 625 ◽  
pp. L7 ◽  
Author(s):  
F. Hofmann ◽  
C. Wegg
Keyword(s):  
Dark Matter ◽  
Sterile Neutrino ◽  
Line Strength ◽  
Galactic Bulge ◽  
Sterile Neutrinos ◽  
Additional Line ◽  
Mixing Angle ◽  
X Ray ◽  
Systematic Uncertainties ◽  
Good Target

Context. An unidentified emission line at 3.55 keV was recently detected in X-ray spectra of clusters of galaxies. The line has been discussed as a possible decay signature of 7.1 keV sterile neutrinos, which have been proposed as a dark matter (DM) candidate. Aims. We aim to further constrain the line strength and its implied mixing angle under the assumption that all DM is made of sterile neutrinos. Methods. The X-ray observations of the Limiting Window (LW) towards the Galactic bulge (GB) offer a unique dataset for exploring DM lines. We characterise the systematic uncertainties of the observation and the fitted models with simulated X-ray spectra. In addition, we discuss uncertainties of indirect DM column density constraints towards the GB to understand systematic uncertainties in the assumed DM mass in the field of view of the observation. Results. We find tight constraints on the allowed flux for an additional line at 3.55 keV with a positive (∼1.5σ) best fit value FX3.55 keV ≈ (4.5 ± 3.5) × 10−7 cts cm−2 s−1. This would translate into a mixing angle of sin2(2Θ) ≈ (2.3 ± 1.8) × 10−11 which, while consistent with some recent results, is in tension with earlier detections. Conclusions. We used a very deep dataset with well understood systematic uncertainties to derive tight constraints on the mixing angle of a 7.1 keV sterile neutrino DM candidate. The results highlight that the inner Milky Way will be a good target for DM searches with upcoming missions like eROSITA, XRISM, and ATHENA.

scholarly journals The lensing properties of subhaloes in massive elliptical galaxies in sterile neutrino cosmologies

2019 ◽  
Vol 491 (1) ◽  
pp. 1295-1310 ◽  
Author(s):  
Giulia Despali ◽  
Mark Lovell ◽  
Simona Vegetti ◽  
Robert A Crain ◽  
Benjamin D Oppenheimer
Keyword(s):  
Dark Matter ◽  
Power Spectrum ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
Distribution Density ◽  
Sterile Neutrino ◽  
Power Spectra ◽  
Mass Function ◽  
Elliptical Galaxies ◽  
Hydrodynamical Simulations

ABSTRACT We use high-resolution hydrodynamical simulations run with the EAGLE model of galaxy formation to study the differences between the properties of – and subsequently the lensing signal from – subhaloes of massive elliptical galaxies at redshift 0.2, in Cold and Sterile Neutrino (SN) Dark Matter models. We focus on the two 7 keV SN models that bracket the range of matter power spectra compatible with resonantly produced SN as the source of the observed 3.5 keV line. We derive an accurate parametrization for the subhalo mass function in these two SN models relative to cold dark matter (CDM), as well as the subhalo spatial distribution, density profile, and projected number density and the dark matter fraction in subhaloes. We create mock lensing maps from the simulated haloes to study the differences in the lensing signal in the framework of subhalo detection. We find that subhalo convergence is well described by a lognormal distribution and that signal of subhaloes in the power spectrum is lower in SN models with respect to CDM, at a level of 10–80 per cent, depending on the scale. However, the scatter between different projections is large and might make the use of power spectrum studies on the typical scales of current lensing images very difficult. Moreover, in the framework of individual detections through gravitational imaging a sample of ≃30 lenses with an average sensitivity of $M_{\rm {sub}} = 5 \times 10^{7}\, {\rm M}_{\odot}$ would be required to discriminate between CDM and the considered sterile neutrino models.

scholarly journals Impact of sterile neutrino dark matter on core-collapse supernovae

2016 ◽  
Vol 31 (25) ◽  
pp. 1650137 ◽  
Author(s):  
Mackenzie L. Warren ◽  
Grant J. Mathews ◽  
Matthew Meixner ◽  
Jun Hidaka ◽  
Toshitaka Kajino
Keyword(s):  
Dark Matter ◽  
Sterile Neutrino ◽  
Core Collapse ◽  
Observable Effect ◽  
Sterile Neutrinos ◽  
X Ray ◽  
Core Collapse Supernova ◽  
Electron Neutrinos ◽  
Supernova Explosions ◽  
The Impact

We summarize the impact of sterile neutrino dark matter on core-collapse supernova explosions. We explore various oscillations between electron neutrinos or mixed [Formula: see text] neutrinos and right-handed sterile neutrinos that may occur within a core-collapse supernova. In particular, we consider sterile neutrino masses and mixing angles that are consistent with sterile neutrino dark matter candidates as indicated by recent X-ray flux measurements. We find that the interpretation of the observed 3.5 keV X-ray excess as due to a decaying 7 keV sterile neutrino that comprises 100% of the dark matter would have almost no observable effect on supernova explosions. However, in the more realistic case in which the decaying sterile neutrino comprises only a small fraction of the total dark matter density due to the presence of other sterile neutrino flavors, WIMPs, etc. a larger mixing angle is allowed. In this case a 7 keV sterile neutrino could have a significant impact on core-collapse supernovae. We also consider mixing between [Formula: see text] neutrinos and sterile neutrinos. We find, however, that this mixing does not significantly alter the explosion and has no observable effect on the neutrino luminosities at early times.

scholarly journals The Epoch of Reionization in Warm Dark Matter Scenarios

2021 ◽  
Author(s):  
M. Romanello ◽  
N. Menci ◽  
M. Castellano
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Luminosity Function ◽  
Volume Fraction ◽  
Sterile Neutrino ◽  
Power Spectra ◽  
Upper Limit ◽  
History Of ◽  
Initial Power ◽  
Early Galaxy

In this paper we investigate how the Reionization process is affected by early galaxy formation in different cosmological scenarios. We use a semi-analytic model with suppressed initial power spectra to obtain the UV Luminosity Function in thermal Warm Dark Matter and sterile neutrino cosmologies. We retrace the ionization history of intergalactic medium with hot stellar emission only, exploiting fixed and variable photons escape fraction models ( fesc). For each cosmology, we find an upper limit to fixed fesc, which guarantees the completion of the process at z <6.7. The analysis is tested with two limit hypothesis on high-z ionized hydrogen volume fraction, comparing our predictions with observational results.

scholarly journals Warm FIRE: simulating galaxy formation with resonant sterile neutrino dark matter

2018 ◽  
Vol 483 (3) ◽  
pp. 4086-4099 ◽  
Author(s):  
Brandon Bozek ◽  
Alex Fitts ◽  
Michael Boylan-Kolchin ◽  
Shea Garrison-Kimmel ◽  
Kevork Abazajian ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Sterile Neutrino

scholarly journals Cooling Flows and the Formation of Dark matter

1987 ◽  
Vol 117 ◽  
pp. 201-213 ◽  
Author(s):  
A. C. Fabian ◽  
K. A. Arnaud ◽  
P. A. Thomas
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Elliptical Galaxies ◽  
High Mass ◽  
Clusters Of Galaxies ◽  
Local Models ◽  
X Ray ◽  
Cooling Flows ◽  
Mass Profiles

The distribution of matter condensing out of cooling flows in clusters of galaxies and individual elliptical galaxies has been studied using X-ray data and is found to resemble the expected mass profiles of the underlying galaxies. Most of the cooled gas must create objects of high mass-to-light ratio, although some more normal stars are produced. Cooling flows provide an observable mechanism for the continual formation of dark matter around galaxies. Since the conditions at galaxy formation are similar to those in cooling flows if the gas reaches the virial temperature, we suggest that they are local models of galaxy formation.

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