Gravitationally trapped axions on the Earth

Lawson, Kyle; Liang, Xunyu; Mead, Alexander; Siddiqui, Shahriar Rahim; Waerbeke, Ludovic Van; Zhitnitsky, Ariel R.

doi:10.1103/physrevd.100.043531

Cited by 31 publications

(55 citation statements)

References 77 publications

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“…where ρ DM is the local density of DM and R ⊕ = 6371 km is the radius of the Earth and Φ is the total hit rate of AQNs on Earth [48]. In Formula (9) the T is the time of operation while A eff is the effective area to be estimated below.…”

Section: Event Rate Of Mmementioning

confidence: 99%

Multi-Modal Clustering Events Observed by Horizon-10T and Axion Quark Nuggets

Zhitnitsky

2021

Universe

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The Horizon-10T collaboration have reported observation of Multi-Modal Events (MME) containing multiple peaks suggesting their clustering origin. These events are proven to be hard to explain in terms of conventional cosmic rays (CR). We propose that these MMEs might be result of the dark matter annihilation events within the so-called axion quark nugget (AQN) dark matter model, which was originally invented for completely different purpose to explain the observed similarity between the dark and the visible components in the Universe, i.e., ΩDM∼Ωvisible without any fitting parameters. We support this proposal by demonstrating that the observations, including the frequency of appearance, intensity, the spatial distribution, the time duration, the clustering features, and many other properties nicely match the emission characteristics of the AQN annihilation events in atmosphere. We list a number of features of the AQN events which are very distinct from conventional CR air showers. The observation (non-observation) of these features may substantiate (refute) our proposal.

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Section: Event Rate Of Mmementioning

confidence: 99%

Multi-Modal Clustering Events Observed by Horizon-10T and Axion Quark Nuggets

Zhitnitsky

2021

Universe

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“…The estimate (3) explicitly shows that conventional DM detectors are too small in size to detect AQNs directly as the corresponding flux is many orders of magnitude smaller than the one due to the conventional WIMPs. The total hit rate for entire earth's surface is given by [51]:…”

Section: A Aqn Flux On Earthmentioning

confidence: 99%

DAMA/LIBRA annual modulation and axion quark nugget dark matter model

Zhitnitsky

2020

Phys. Rev. D

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The DAMA/LIBRA experiment shows 9.5σ evidence for an annual modulation in the (1 − 6) keV energy range, strongly suggesting that the observed modulation has the dark matter origin. However, the conventional interpretation in terms of WIMP-nucleon interaction is excluded by other experiments. We propose an alternative source of modulation in the form of neutrons, which have been liberated from surrounding material. Our computations are based on the so-called Axion Quark Nugget (AQN) dark matter model, which was originally invented long ago to explain the similarity between the dark and visible cosmological matter densities, i.e. Ω dark ∼ Ω visible . In our proposal the annual modulation is shown to be generated in keV energy range which is consistent with DL observation in (1 − 6) keV range. This keV energy scale in our proposal is mostly determined by spectral properties of the neutrinos emitted by the AQN dark matter particles, while the absence of the modulation with energies above 6 keV is explained by a sharp cutoff in the neutrino's energy spectrum at ∼ 15 MeV. This proposal can be directly tested by COSINE-100, ANAIS-112 and CYGNO experiments. It can be also tested by studying the correlations between the signals from these experiments and nearby axion search detectors.

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“…They finally evolve into the axion quark nuggets (AQNs) which have many intriguing astrophysical and cosmological implications. See the original paper [54] and recent developments [40,44,[55][56][57][58][59][60][61][62][63][64] for details.…”

Section: Size Distribution Of Closed Axion Dwsmentioning

confidence: 99%

Sublunar-mass primordial black holes from closed axion domain walls

Ge¹

2020

Physics of the Dark Universe

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We study the formation of primordial black holes (PBHs) from the collapse of closed domain walls (DWs) which naturally arise in QCD axion models near the QCD scale together with the main string-wall network. The size distribution of the closed DWs is determined by percolation theory, from which we further obtain PBH mass distribution and abundance. Various observational constraints on PBH abundance in turn also constrain QCD axion parameter space. Our model prefers axion mass at the meV scale ( f a ∼ 10 9 GeV). The corresponding PBHs are in the sublunar-mass window 10 20 -10 22 g (i.e., 10 −13 -10 −11 M ), one of few mass windows still available for PBHs contributing significantly to dark matter (DM). In our model, PBH abundance could reach ∼ 1% of DM, sensitive to the formation efficiency of closed axion DWs.

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Gravitationally trapped axions on the Earth

Cited by 31 publications

References 77 publications

Multi-Modal Clustering Events Observed by Horizon-10T and Axion Quark Nuggets

Multi-Modal Clustering Events Observed by Horizon-10T and Axion Quark Nuggets

DAMA/LIBRA annual modulation and axion quark nugget dark matter model

Sublunar-mass primordial black holes from closed axion domain walls

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