Sergio Bertolucci, Horst Fischer, Sebastian Hofmann, Marios Maroudas, Yannis Semertzidis, Konstantin Zioutas
In this short note we argue why the conclusions made by the authors of arXiv:1908.04675, related to arXiv:1805.05184 and in particular arXiv:1602.03666 given therein, are incorrect. Nevertheless, we think that the advocated Anti-Quark Nuggets are good candidates for the dark Universe, and therefore they deserve further attention.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
We study the new mechanism of the axion production suggested recently in [1,2]. This mechanism is based on the so-called Axion Quark Nugget (AQN) dark matter model, which was originally invented to explain the similarity of the dark and visible cosmological matter densities. We perform numerical simulations to evaluate the axion flux on the Earth's surface. We examine annual and daily modulations, which have been studied previously and are known to occur for any type of dark matter. We also discuss a novel type of short time enhancements which are unique to the AQN model: the statistical fluct…
Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions
本文证明重轴子相干振荡可导致轻轴子势符号翻转甚至消失，此现象类似Kapitza摆但源于轴子固有质量等级与混合，晚期符号翻转能显著增加轻轴子丰度，具有宇宙学和观测意义。
In this paper, we consider dynamical Chern-Simons gravity with the identification of the scalar field coupled though the Pontryagin density with the axion dark matter, and we discuss the effects of the parametric resonance on gravitational waves (GWs). When we consider GWs in a coherently oscillating axion cloud, we confirm that significant resonant amplification of GWs occurs in a narrow frequency band, and the amplification is restricted to the late epoch after the passage of the incident waves. We also identify the condition that an axion cloud spontaneously emits GWs. Once we take into acc…
We demonstrate the parametric amplification of the stochastic gravitational wave background during inflationary reheating and during axion/moduli oscillations. This amplification enhances the detectability of the string/inflationary gravity wave signal, leaving a finger-print on the spectrum which might be found with future gravitational wave detectors.
Coherent versus incoherent amplification: from parametric resonance to the kinetic regime in stimulated axion decay
本文研究受激轴子衰变中相干与不相干放大的差异，揭示参数共振（$s\propto g_{a\gamma}$）与动力学行为（$s\propto g_{a\gamma}^2$）源于轴子场的相干性，并推导出统一的有效演化方程及交叉描述。
We study parameter space in the axion monodromy inflation corrected by dynamically generated terms involving with the axion. The potential has the linear potential with multiple sinusoidal functions, which play a role in generating modulations. We show that this potential leads both to a large tensor-to-scalar ratio $r_T \sim 0.16$ and to a large negative running of spectral index $α_s \sim - (0.02 -0.03)$. To realize these results, a small hierarchy among dynamical scales is required whereas the decay constants in sinusoidal functions remain sub-Planckian in this model. We discuss also reheat…
It is shown, that the energy density of coherent axion field oscillations in the cosmology of standard invisible axion should be distributed in the Universe in the form of archioles, being nonlinear inhomogeneous structure, reflecting the large scale distribution of Brownian structure of axion strings in the very early Universe. Spectrum of inhomogeneities, generated by archioles, is obtained and their effects in the spectrum and quadrupole anisotropy of relic radiation are considered. The axionic-string-decay-model-independent restriction on the scale of axion interaction is obtained.
Cosmic Axions Revealed via Amplified Modulation of Ellipticity of Laser (CARAMEL)
利用激光椭圆率调制和电光晶体探测轴子暗物质，通过射频增强提高灵敏度，实现紧凑高频轴子搜索。
In the present work we study possible time dependent effects in Axion Dark Matter searches employing resonant cavities. We find that the width of the resonance, which depends on the axion mean square velocity in the local frame, will show an annual variation due to the motion of the Earth around the sun (modulation). Furthermore, if the experiments become directional, employing suitable resonant cavities, one expects large asymmetries in the observed widths relative to the sun's direction of motion. Due to the rotation of the Earth around its axis, these asymmetries will manifest themselves as…
Blazar Constraints on Axions through New Spectral Modulation Searches in 1ES 1959+650 & B2 1811+31
本文通过分析1ES 1959+650和B2 1811+31的光谱调制数据，研究轴子与光子耦合，排除了轴子质量在10^-9 eV至10^-8 eV范围内的可能性，并探讨了模型不确定性对约束的影响。
The DAMA/LIBRA experiment shows $9.5 σ$ evidence for an annual modulation in the $(1-6)~ {\rm keV}$ 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 an…
Annual-modulation fingerprint of the axion wind induced sideband triplet in quantum dot spin qubit sensors
利用硅量子点自旋量子比特，提出一种高灵敏度磁强计探测轴子与电子耦合，通过年度调制指纹提高信号检测灵敏度。
In theories with the large extra dimensions beyond the standard 4-dimensional spacetime, axions could propagate in such extra dimensions, and acquire Kaluza-Klein (KK) excitations. These KK axions are produced in the Sun and could solve unexplained heating of the solar corona. While most of the solar KK axions escape from the solar system, a small fraction is gravitationally trapped in orbits around the Sun. They would decay into two photons inside a terrestrial detector. The event rate is expected to modulate annually depending on the distance from the Sun. We have searched for the annual mod…
We extend previous searches for X-ray spectral modulations induced by ALP-photon conversion to a variety of new sources, all consisting of quasars or AGNs located in or behind galaxy clusters. We consider a total of seven new sources, with data drawn from the Chandra archive. In all cases the spectrum is well fit by an absorbed power-law with no evidence for spectral modulations, allowing constraints to be placed on the ALP-photon coupling parameter $g_{aγγ}$. Two sources are particularly good: the Seyfert galaxy 2E3140 in A1795 and the AGN NGC3862 within the cluster A1367, leading to 95\% bou…
We advocate an idea that the presence of the daily and annual modulations of the axion flux on the Earth surface may dramatically change the strategy of the axion searches. Our computations are based on the so-called Axion Quark Nugget (AQN) dark matter model which was originally put forward to explain the similarity of the dark and visible cosmological matter densities $Ω_{\rm dark}\sim Ω_{\rm visible}$. In our framework, the population of galactic axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ and velocity $< v_a>\sim 10^{-3} c$ will be always accompanied by the axi…
We study the electromagnetic wave propagation in the joint dilaton field and axion field. Dilaton field induces amplification/attenuation in the propagation while axion field induces polarization rotation. The amplification/attenuation induced by dilaton is independent of the frequency (energy) and the polarization of electromagnetic waves (photons). From observations, the agreement with and the precise calibration of the cosmic microwave background (CMB) to blackbody radiation constrains the fractional change of dilaton |Δψ|/ψ to less than about 8 x 10^(-4) since the time of the last scatteri…
We study the pattern of oscillations in the primordial power spectrum in axion monodromy inflation, accounting for drifts in the oscillation period that can be important for comparing to cosmological data. In these models the potential energy has a monomial form over a super-Planckian field range, with superimposed modulations whose size is model-dependent. The amplitude and frequency of the modulations are set by the expectation values of moduli fields. We show that during the course of inflation, the diminishing energy density can induce slow adjustments of the moduli, changing the modulatio…
In the present work we study possible time signatures Axion Dark Matter searches employing resonant cavities for various halo models. We study in particular the time dependence of the resonance width (modulation) and possible asymmetries in directional experiments.
RadioAxion results on the search for axion dark matter under Gran Sasso
通过监测^{241}Am的α衰变γ线，利用Gran Sasso实验室的NaI探测器寻找轴子暗物质引起的周期性调制，未发现调制信号并对轴子衰变常数在10^{-21}至10^{-9}eV质量范围给出约束。
Daily modulations and broadband strategy in axion searches. An application with CAST-CAPP detector
本文基于AQN暗物质模型，利用CAST-CAPP探测器数据研究相对论性轴子的日调制与宽带探测策略，虽未能确证暗区日调制，但为未来轴子搜寻提供了原理验证性分析流程。
In cavity-based axion dark matter detectors, quantum noise remains a primary barrier to achieving the scan rate necessary for a comprehensive search of axion parameter space. Here we introduce a method of scan rate enhancement in which an axion-sensitive cavity is coupled to an auxiliary resonant circuit through simultaneous two-mode squeezing (entangling) and state swapping interactions. We show analytically that when combined, these interactions can amplify an axion signal before it becomes polluted by vacuum noise introduced by measurement. This internal amplification yields a wider bandwid…
Axion-like Dark Matter Search with Space-based Gravitational Wave Detectors
本文提出利用空间引力波探测器的光学基准改进，以检测轴子类暗物质引起的双折射，扩展了探测器的物理能力。
Well-motivated extensions of the standard model predict ultra-light and fundamental pseudo-scalar particles (e.g., axions or axion-like particles: ALPs). Similarly to the Primakoff-effect for axions, ALPs can mix with photons and consequently be searched for in laboratory experiments and with astrophysical observations. Here, we search for energy-dependent modulations of high-energy gamma-ray spectra that are tell-tale signatures of photon-ALPs mixing. To this end, we analyze the data recorded with the Fermi -LAT from Galactic pulsars selected to have a line of sight crossing spiral arms at a …
Axion like particles (ALPs) are fundamental pseudo scalar particles with properties similar to Axions which are a well-known extension of the standard model to solve the strong CP problem in Quantum Chromodynamics. ALPs can oscillate into photons and vice versa in the presence of an external tranversal magnetic field. This oscillation of photon and ALPs could have important implications for astronomical observations, i.e. a characteristic energy dependent attenuation in Gamma ray spectra for astrophysical sources. Here we have revisited the opportunity to search Photon-ALPs coupling in the dis…
X-ray annual modulation observed by XMM-Newton and Axion Quark Nugget Dark Matter
本研究针对XMM-牛顿观测到的近地2-6 keV X射线背景11σ置信度季节性调制现象，用轴子夸克块（AQN）暗物质模型解释，预测20%-25%的调制幅度及百keV能段贡献，提出用GBM、NuSTAR存档数据检验该模型。
Axion-like particles (ALPs) can induce localised oscillatory modulations in the spectra of photon sources passing through astrophysical magnetic fields. Ultra-deep Chandra observations of the Perseus cluster contain over $5 \times 10^5$ counts from the AGN of the central cluster galaxy NGC1275, and represent a dataset of extraordinary quality for ALP searches. We use this dataset to search for X-ray spectral irregularities from the AGN. The absence of irregularities at the O(30%) level allows us to place leading constraints on the ALP-photon mixing parameter $g_{aγγ} \lesssim 1.4 - 4.0 \times …
Time-Domain Axion Searches with Magnetic White Dwarfs
研究利用磁白矮星进行时域轴子搜索，开发可控背景简并框架，通过TESS观测PG~1015+014，发现高次谐波恒星变化性是主要简并因素，获得亚微电子伏特轴子限制并推导其他磁白矮星目标排名估计。
A brief review of light dark matter particles and their spectroscopy is presented, specifically aimed at understanding the interaction mechanisms of axion and Axion-Like Particles (ALPs) with matter and an interim proposal and some ideas for possible detection of these evasive particles. In order to venture into the highly challenging spectral regions and extremely weak signals involved with these searches (especially for the DFSZ axions), a different scheme is proposed departing from the conventional resonant cavity mass scan and heterodyne detection methods. We aim to look for a fixed mass a…
Axion signal search using hybrid nuclear-electronic spin systems
本文提出一种混合架构，通过超精细相互作用将轴子驱动的核自旋进动转换为高带宽电子自旋读出通道，实现对暗物质信号的高效探测。
Weak nuclear decays deep-underground as a probe of axion dark matter
研究弱核衰变的时间调制以探测轴子暗物质，提出理论框架计算弱核衰变的θ依赖性，并通过分析地下实验室的数据约束轴子衰变常数，提出新的测量方法以探测更短时间尺度的轴子质量。
The Cosmic Axion Spin Precession Experiment (CASPEr) is a nuclear magnetic resonance experiment (NMR) seeking to detect axion and axion-like particles which could make up the dark matter present in the universe. We review the predicted couplings of axions and axion-like particles with baryonic matter that enable their detection via NMR. We then describe two measurement schemes being implemented in CASPEr. The first method, presented in the original CASPEr proposal, consists of a resonant search via continuous-wave NMR spectroscopy. This method offers the highest sensitivity for frequencies ran…
Alpha radioactivity deep-underground as a probe of axion dark matter
本研究提出利用地下重同位素α衰变的时间调制探测轴子暗物质，建立了α衰变半衰期的θ依赖理论，并搭建RadioAxion-α原型实验，可在宽轴子质量范围给出有竞争力的衰变常数限制。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。