论文标题
用meerkat和ska进行斧头状的粒子搜索
Axion-like particle searches with MeerKAT and SKA
论文作者
论文摘要
在过去的几年中，轴突样颗粒（阿尔卑斯山）的搜索由于可能解释了宇宙中冷暗物质（CDM）的总丰度而显着增长。阿尔卑斯山和光子之间的耦合允许阿尔卑斯山自发衰减成对的光子。对于在星系周围CDM晕圈中凝结的阿尔卑斯邦，也可能进行刺激的阿尔卑斯山腐烂。在这项工作中，我们检查了即将出现的射电望远镜（例如平方公里阵列（SKA）和Meerkat）从此过程中产生的无线电排放的可检测性。我们的结果使用最近更现实的敏感性估计值表明，SKA预测的先前的非观察到上限非常乐观，至少至少通过数量级，矮星系观测的限制削弱了。值得注意的是，由于包含频率依赖性降解效应，我们的结果也比以前更大程度地取决于ALP质量。我们表明，探测阿尔卑斯山的最强潜在环境是附近的射电星系（由于强烈的光子增强因子）。此外，通过使用可见性锥度，质量范围为$ 4.96 \ times 10^{ - 7} \ \ text { - } \ 1.04 \ times 10^{ - 4} \ {\ rm ev} $在Alp-Photon $ g _} $ 18的范围内， 10^{ - 12} \ \ text { - } \ 7.69 \ times 10^{ - 10} \ {\ rm gev}^{ - 1} $ with ska。 Meerkat只能在观察后的50小时内产生类似于铸造实验的极限。最后，我们证明，在银河磁场中，CDM Alps到光子的磁转换是高度次主导的，甚至是自发的衰减。
In the past few years, the search for axion-like particles (ALPs) has grown significantly due to their potential to account for the total abundance of the cold dark matter (CDM) in the universe. The coupling between ALPs and photons allows the spontaneous decay of ALPs into pairs of photons. For ALPs condensed in CDM halos around galaxies, the stimulated decay of ALPs is also possible. In this work, we examine the detectability of the radio emissions produced from this process with forthcoming radio telescopes such as the Square Kilometer Array (SKA) and MeerKAT. Our results, using recent more realistic sensitivity estimates, show that previous non-observation upper-limits projected for the SKA were highly optimistic, with the limits from dwarf galaxy observations being weakened by an order of magnitude at least. Notably, our results also depend far more strongly on ALP mass than previously, due to the inclusion of frequency dependent degradation effects. We show that the strongest potential environment to probe ALPs is nearby radio galaxies (due to the strong photon enhancement factor). In addition, with the use of a visibility taper, ALPs in the mass range of $4.96 \times 10^{-7} \ \text{--} \ 1.04 \times 10^{-4} \ {\rm eV}$ would have non-observation upper limits on the ALP-photon $g_{aγ}$ in the range of $1.83 \times 10^{-12} \ \text{--} \ 7.69 \times 10^{-10} \ {\rm GeV}^{-1}$ with SKA. MeerKAT can only produce limits similar to the CAST experiment within 50 hours of observation. Finally, we demonstrate that magnetic conversion of CDM ALPs to photons, in galactic magnetic fields, is highly sub-dominant, even to spontaneous decay.
