Sterile neutrino Dark Matter

Boyarsky, Alexey; Drewes, Marco; Lasserre, T.; Mertens, S.; Ruchayskiy, Oleg

doi:10.1016/j.ppnp.2018.07.004

Cited by 402 publications

(406 citation statements)

References 520 publications

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“…The initial conditions generator, MUSIC [65], was used to construct the particle distribution on the right, which is a statistical realisation of the CDM linear power spectrum shown on the left. The main limitations for a cosmological simulation are already set in the initial conditions: the maximum lengthscale that can be simulated is determined by the (co-moving) side of the computational cube 16 , and the minimum lengthscale that can represented in the initial conditions is set by the Nyquist frequency of the particle 15 The particles are initially placed at random in the simulation cube and then left to evolve under a repulsive force by reversing the sign of the gravitational force until they reach an equilibrium configuration that has no discernible grid pattern [69]. 16 A sufficiently large volume is needed to sample large-scale modes that remain approximately linear during the simulation where power is transferred from large to small scales; without appropriate large-scale sampling, the clustering is no longer accurate once perturbations on the scale of the cube become non-linear.…”

Section: Figurementioning

confidence: 99%

Dark Matter Haloes and Subhaloes

2019

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The development of methods and algorithms to solve the N-body problem for classical, collisionless, non-relativistic particles has made it possible to follow the growth and evolution of cosmic dark matter structures over most of the Universe's history. In the best studied case -the cold dark matter or CDM model -the dark matter is assumed to consist of elementary particles that had negligible thermal velocities at early times. Progress over the past three decades has led to a nearly complete description of the assembly, structure and spatial distribution of dark matter haloes, and their substructure in this model, over almost the entire mass range of astronomical objects. On scales of galaxies and above, predictions from this standard CDM model have been shown to provide a remarkably good match to a wide variety of astronomical data over a large range of epochs, from the temperature structure of the cosmic background radiation to the large-scale distribution of galaxies. The frontier in this field has shifted to the relatively unexplored subgalactic scales, the domain of the central regions of massive haloes, and that of low-mass haloes and subhaloes, where potentially fundamental questions remain. Answering them may require: (i) the effect of known but uncertain baryonic processes (involving gas and stars), and/or (ii) alternative models with new dark matter physics. Here we present a review of the field, focusing on our current understanding of dark matter structure from N-body simulations and on the challenges ahead.

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Section: Figurementioning

confidence: 99%

Dark Matter Haloes and Subhaloes

2019

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“…Sterile neutrinos with mass of O(keV) and a spectrum close to thermal constitute a viable Warm DM (WDM) candidate (see e.g. [8]). Sterile neutrinos without additional interactions beyond the SM are produced in the early Universe through active-sterile flavor oscillations and collisional processes.…”

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confidence: 99%

“…If sterile neutrinos constitute the DM, their freestreaming would suppress structure formation below the free-streaming length (see e.g. [8])…”

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confidence: 99%

Visible sterile neutrinos as the earliest relic probes of cosmology

Gelmini

Takhistov

2020

Physics Letters B

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A laboratory detection of a sterile neutrino could provide the first indication of the evolution of the Universe before Big-Bang Nucleosynthesis (BBN), an epoch yet untested. Such "visible" sterile neutrinos are observable in upcoming experiments such as KATRIN/TRISTAN and HUNTER in the keV mass range and PTOLEMY and others in the eV mass range. A set of standard assumptions is typically made about cosmology before the temperature of the Universe was 5 MeV. However, non-standard pre-BBN cosmologies based on alternative assumptions could arise in motivated theoretical models and are equally in agreement with all existing data. We revisit the production of sterile neutrinos of mass 0.01 eV to 1 MeV in two examples of such models: scalar-tensor and low reheating temperature pre-BBN cosmologies. In both of them, the putative 3.5 keV X-ray signal line corresponds to a sterile neutrino with a mixing large enough to be tested in upcoming laboratory experiments. Additionally, the cosmological/astrophysical upper limits on active-sterile neutrino mixings are significantly weaker than in the standard pre-BBN cosmology, which shows that these limits are not robust. For example, in the scalar-tensor case the potential signal regions implied by the LSND and MiniBooNE short-baseline as well as the DANSS and NEOS reactor experiments are entirely not bound by cosmological restrictions. Our work highlights that sterile neutrinos may constitute a sensitive probe of the pre-BBN epoch.The cosmological evolution of the Universe before its temperature was T = 5 MeV is unknown because we have not detected so far any remnant from it. The earliest cosmological remnants are so far the light nuclei produced during Big Bang Nucleosynthesis (BBN) and if the highest temperature of the radiation-domination epoch in which BBN happened was just 5 MeV, BBN and all the subsequent evolution of the Universe would be unchanged [1][2][3][4][5][6]. Assumptions are made about cosmology to compute the relic abundance and momentum distributions of dark matter (DM) particles which are produced in this pre-BBN epoch. The standard assumptions are that the Universe was radiation-dominated, that only Standard Model (SM) particles are present and that no extra entropy in matter and radiation is produced. We call this set of assumptions the standard pre-BBN cosmology, which is an extension at higher temperatures of the standard cosmology we know at lower temperatures, T < 5 MeV. However, cosmologies based on alternative assumptions are equally in agreement with all existing data. The pre-BBN cosmological evolution could drastically differ from standard in some well motivated theoretical models, e.g. some based on moduli, extra dimensions or quintessence. A non-standard cosmological evolution, consistent with all existing bounds, could drastically affect the properties of any relics produced before the temperature of the Universe was 5 MeV. Detecting any relics sensitive to the pre-BBN cosmological history will open a new window into this yet unexplored epoch. Th...

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“…The expected background rate of 6 events in the entire run (an equivalent of 6 × 10 −4 [kg keV day] −1 ) and could set 90% C.L. cross-section limits for 5 (20) GeV/c 2 of 4.3 × 19 −40 (9.4 × 10 −44 ) cm 2 [171]. The EDELWEISS collaboration have since undertaken EDELWEISS-Surf [173], an above ground measurement experiment for low < 1 GeV/c 2 masses using a 10mK dry dilution cryostat at the Institut de Physique Nucléaire de Lyon based around a 33.4 g germanium detector with a neutron-transmuation doped germanium sensor similar to previous detectors to date.…”

Section: Edelweissmentioning

confidence: 99%

Annual modulation in direct dark matter searches

Froborg

Duffy

2020

J. Phys. G: Nucl. Part. Phys.

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The measurement of an annual modulation in the event rate of direct dark matter detection experiments is a powerful tool for dark matter discovery. Indeed, several experiments have already claimed such a discovery in the past decade. While most of them have later revoked their conclusions, and others have found potentially contradictory results, one still stands today. This paper explains the potential as well as the challenges of annual modulation measurements, and gives an overview on past, present and future direct detection experiments.

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Sterile neutrino Dark Matter

Cited by 402 publications

References 520 publications

Dark Matter Haloes and Subhaloes

Dark Matter Haloes and Subhaloes

Visible sterile neutrinos as the earliest relic probes of cosmology

Annual modulation in direct dark matter searches

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