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arXiv 1907.04849astro-ph.COastro-ph.HE
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Background Radiation共振增强对轴子凝聚暗物质的约束

Axion Condensate Dark Matter Constraints from Resonant Enhancement of Background Radiation

Günter Sigl, Pranjal Trivedi

摘要:

研究了类轴子暗物质背景下光子振幅的参量增长。观测到的河外背景辐射限制了允许的增强效应。我们推导出由此产生的约束轴子光子耦合常数$g_{aγ}$从银河系ALP凝聚以及过密度。如果我们的银河系中存在大小为$R$的ALP凝聚体,那么扫描频率为$ν$的极窄未分辨谱线可以将ALP质量为$m_a=4πν$的轴子-光子耦合限制为$g_{aγ}\lesssim2\times10^{-14}(10\,{\rm kpc}/R)\,{\rm GeV}^{-1}$。无线电光学背景数据产生的约束,在这一水平内观察到的波段或ALP质量窗口在一个广泛的范围$0.08\, μ\text{eV} \lesssim m_a \lesssim 8 \text{ eV}$。这些对$g_{aγ}$的凝聚约束探测到$m_a \gtrsim$ 10 $μ$ eV的QCD轴子带。

英文摘要:

We investigate the possible parametric growth of photon amplitudes in a background of axion-like particle (ALP) dark matter. The observed extragalactic background radiation limits the allowed enhancement effect. We derive the resulting constraints on the axion-photon coupling constant $g_{aγ}$ from Galactic ALP condensates as well as over-densities. If ALP condensates of size $R$ exist in our Galaxy, a scan for extremely narrow unresolved spectral lines with frequency $ν$ can constrain the axion-photon coupling at ALP mass $m_a=4πν$ to $g_{aγ}\lesssim2\times10^{-14}(10\,{\rm kpc}/R)\,{\rm GeV}^{-1}$. Radio to optical background data yield constraints at this level within observed wavebands or ALP mass windows over a broad range $0.08\, μ\text{eV} \lesssim m_a \lesssim 8 \text{ eV}$. These condensate constraints on $g_{aγ}$ probe down to the QCD axion band for $m_a \gtrsim$ 10 $μ$eV.

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