Possible Resonance Effect of Axionic Dark Matter in Josephson Junctions

Beck, Christian

doi:10.1103/physrevlett.111.231801

Cited by 73 publications

(97 citation statements)

References 45 publications

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“…Interestingly enough, this range of the axion mass m a 10 −4 eV is perfectly consistent with recent claim [39], [40] that the previously observed small signal in resonant S/N/S Josephson junction [41] is a result of the dark matter axions with the mass m a 1.1 · 10 −4 eV. We conclude this section on optimistic note with a remark that the most interesting region of the parametric space with mean baryon charge B…”

Section: Implications For the Axion Search Experimentssupporting

confidence: 92%

Beyond WIMPs: the Quark (Anti) Nugget Dark Matter

Zhitnitsky

2017

EPJ Web Conf.

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Abstract. We review a testable dark matter (DM) model outside of the standard WIMP paradigm. The model is unique in a sense that the observed ratio Ω dark Ω visible for visible and dark matter densities finds its natural explanation as a result of their common QCD origin when both types of matter (DM and visible) are formed during the QCD phase transition and both are proportional to single dimensional parameter of the system, Λ QCD . We argue that the charge separation effect also inevitably occurs during the same QCD phase transition in the presence of the CP odd axion field a(x). It leads to preferential formation of one species of nuggets on the scales of the visible Universe where the axion field a(x) is coherent. A natural outcome of this preferential evolution is that only one type of the visible baryons (not anti-baryons) remain in the system after the nuggets complete their formation. Unlike conventional WIMP dark matter candidates, the nuggets and anti-nuggets are strongly interacting but macroscopically large objects. The rare events of annihilation of the anti-nuggets with visible matter lead to a number of observable effects. We argue that the relative intensities for a number of measured excesses of emission from the centre of galaxy (covering more than 11 orders of magnitude) are determined by standard and well established physics. At the same time the absolute intensity of emission is determined by a single new fundamental parameter of the theory, the axion mass, 10 −6 eV m a 10 −3 eV. Finally, we comment on implications of these studies for the axion search experiments, including microwave cavity and the Orpheus experiments.

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Section: Implications For the Axion Search Experimentssupporting

confidence: 92%

Beyond WIMPs: the Quark (Anti) Nugget Dark Matter

Zhitnitsky

2017

EPJ Web Conf.

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“…The result in equation (28) and that given by Beck [54] both satisfy the constraint put by Hoskins et al [55], who found that the local density of non-virialized axionic dark matter should not exceeds 0.2 GeV/cm 3 . According to the BEC theory, the critical temperature is given as [56] T c = 2π…”

Section: Mass Density and Critical Temperaturesupporting

confidence: 77%

Constraints on Bose-Einstein-condensed axion dark matter from the Hi nearby galaxy survey data

2014

Phys. Rev. D

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One of the leading candidates for dark matter is axion or axion-like particle in a form of BoseEinstein condensate (BEC). In this paper, we present an analysis of 17 high-resolution galactic rotation curves from "The HI Nearby Galaxy Survey (THINGS)" data [F. Walter et al., Astron. J. 136, 2563] in the context of the axionic Bose-Einstein condensed dark matter model. Assuming a repulsive two-body interaction, we solve the non-relativistic Gross-Pitaevskii equation for N gravitationally trapped bosons in the Thomas-Fermi approximation. We obtain the maximum possible radius R and the mass profile M (r) of a dilute axionic Bose-Einstein condensed gas cloud. A standard least-χ 2 method is employed to find the best-fit values of the total mass M of the axion BEC and its radius R. The local mass density of BEC axion dark-matter is ρa ≃ 0.02 GeV/cm 3 , which agrees with that presented by Beck [C. Beck, Phys. Rev. Lett. 111, 231801 (2013)]. The axion mass ma we obtain depends not only on the best-fit value of R but also on the s-wave scattering length a (ma ∝ a 1/3 ). The transition temperature Ta of axion BEC on galactic scales is also estimated. Comparing the calculated Ta with the ambient temperature of galaxies and galaxy clusters implies that a ∼ 10 −3 fm. The corresponding axion mass is ma ≃ 0.58 meV. We compare our results with others.

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“…So, there is a need for solutions that can lead to an increase in the axion detecting mode volume while preserving the number of detecting systems and high resonant frequency. In particular, high mass axions yielding high frequency photons (> 15GHz) are motivated theoretically [13], and by some curious experimental results [14], but are as yet largely unprobed, although some recent proposals and experiments have begun to move in this direction [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Axion detection with negatively coupled cavity arrays

2018

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Using eigenmode analysis and full 3D FEM modelling, we demonstrate that a closed cavity built of an array of elementary harmonic oscillators with negative mutual couplings exhibits a dispersion curve with lower order modes corresponding to higher frequencies. Such cavity arrays may help to achieve large mode volumes for boosting sensitivity of the axion searches, where the mode volume for the composed array scales proportional to the number of elements, but the frequency remains constant. The negatively coupled cavity array is demonstrated with magnetically coupling coils, where the sign of next-neighbour coupling (controlled with their chirality) sets the dispersion curve properties of the resonator array medium. Furthermore, we show that similar effects can be achieved using only positively coupled cavities of different frequencies assembled in periodic cells. This principle is demonstrated for the multi-post re-entrant system, which can be realised with an array of straight metallic rods organised in chiral structures.

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Possible Resonance Effect of Axionic Dark Matter in Josephson Junctions

Cited by 73 publications

References 45 publications

Beyond WIMPs: the Quark (Anti) Nugget Dark Matter

Beyond WIMPs: the Quark (Anti) Nugget Dark Matter

Constraints on Bose-Einstein-condensed axion dark matter from the Hi nearby galaxy survey data

Axion detection with negatively coupled cavity arrays

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