论文标题
磁铁PSR J1745-2900对轴子暗物质的新限制
New Limits on Axionic Dark Matter from the Magnetar PSR J1745-2900
论文作者
论文摘要
斧头是一个有前途的暗物质候选者，它被激励解决强大的CP问题，并且也可能解决宇宙学物质 - 抗逆不是对称性。在存在强磁场的情况下，轴突 - 光子转换是可能的，因此产生的光子的能量将等于轴突质量。在这里，我们报告了从银河中心磁铁PSR PSR J1745-2900的无线电光谱获得的轴基暗物质的新限制。磁场的磁场为$ 1.6 \ times10^{14} $ g，与暗物质密度$ 2 \ times10^5 $至$ 2 \ times10^9 $倍，比陆地卤素遇到的当地暗物质高，取决于银河系暗物质。在4.1-165.6 $μ$ EV（1-40 GHz）的62％范围内，未检测到显着的光谱特征。对两光子耦合强度$ g_ {aγγ} $的解释限制了限制的限制取决于磁层转换模型和银河系中心的暗物质密度。对于标准的暗物质配置文件，我们排除了$ g_ {aγγ}> $ 6-34 $ \ times 10^{ - 12} $ gev $^{ - 1} $，对质量4.2-8.4，8.9-8.4，8.9-10.0，8.9-10.0，12.3-16.4，18.6-16.6-26-26.9，33.9，33.0-74.70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.1，70.11，70.1，70。 78.1-80.7，105.5-109.6，111.6-115.2，126.0-159.3和162.5-165.6 $μ$ $ EV。对于SGR A*附近的恒星轨道允许的最大暗物质尖端，这些限制降低到$ g_ {aγγ}> $ 6-34 $ \ times10^{ - 14} $ GEV $^{ - 1} $，排除了一些质量$> 33 $ $ $ $ $ $ $ $ $ $ $ $ $的理论模型。通过建模刺激的轴突转换，通过射线追踪磁层中的射线转换途径以及获得更深的磁体宽带观测值，可以通过建模刺激的轴突转换来提高限制。
Axions are a promising dark matter candidate that were motivated to solve the strong CP problem and that may also address the cosmological matter-antimatter asymmetry. Axion-photon conversion is possible in the presence of the strong magnetic fields, and the photon so produced will have energy equal to the axion mass. Here we report new limits on axionic dark matter obtained from radio spectra of the Galactic Center magnetar PSR J1745-2900. The magnetar has a magnetic field of $1.6\times10^{14}$ G that interacts with a dark matter density $2\times10^5$ to $2\times10^9$ times greater than the local dark matter encountered by terrestrial haloscopes, depending on the Galactic dark matter profile. No significant spectral features are detected across 62% of the axion mass range 4.1-165.6 $μ$eV (1-40 GHz). The interpretation of flux limits into limits on the two-photon coupling strength $g_{aγγ}$ depends on the magnetospheric conversion model and on the dark matter density at the Galactic Center. For a standard dark matter profile, we exclude axion models with $g_{aγγ}> $ 6-34 $\times 10^{-12}$ GeV$^{-1}$ with 95% confidence over the mass ranges 4.2-8.4, 8.9-10.0, 12.3-16.4, 18.6-26.9, 33.0-62.1, 70.1-74.3, 78.1-80.7, 105.5-109.6, 111.6-115.2, 126.0-159.3, and 162.5-165.6 $μ$eV. For the maximal dark matter cusp allowed by stellar orbits near Sgr A*, these limits reduce to $g_{aγγ} > $ 6-34 $ \times10^{-14}$ GeV$^{-1}$, which exclude some theoretical models for masses $> 33$ $μ$eV. Limits may be improved by modeling stimulated axion conversion, by ray-tracing conversion pathways in the magnetar magnetosphere, and by obtaining deeper broad-band observations of the magnetar.
