论文标题
用Parkes Pulsar定时阵列限制超轻矢量暗物质第二个数据发布
Constraining ultralight vector dark matter with the Parkes Pulsar Timing Array second data release
论文作者
论文摘要
模糊的暗物质由超轻玻色子组成，为标准的冷暗物质模型在半乳酸尺度上遇到的挑战提供了一种有趣的解决方案。具有质量$ M \ sim10^{ - 23} \ rm {ev} $的超轻暗物质将引起纳米氏菌带中具有频率的重力振荡的定期振荡，从而在脉冲脉冲的到达时间中可观察到可观察到的效果。与标量暗物质不同，矢量暗物质引起的脉冲星时信号取决于矢量场的振荡方向。在这项工作中，我们通过其在Parkes Pulsar Timing Array（PPTA）的第二个数据发布中，在$ [2 \ times 10^{ - 24}，2 \ times 10^{ - 22}] {\ rm {ev}} $的质量范围内搜索超低矢量暗物质。由于没有统计学上的显着检测，因此我们将$ 95 \％$上限放在局部暗物质密度上为$ρ_{\ rm {\ rm {\ tiny {vf}}} \ sillssim 5 {\ rm {gev/cm^{3}} $ for $ m \ m \ m \ sielssim 10^{ - 23} {\ rm {ev}} $。由于未发现矢量暗物质的首选方向，因此这些约束与标量暗物质搜索所给出的限制与PPTA的12年数据集相当。
Composed of ultralight bosons, fuzzy dark matter provides an intriguing solution to challenges that the standard cold dark matter model encounters on sub-galactic scales. The ultralight dark matter with mass $m\sim10^{-23} \rm{eV}$ will induce a periodic oscillation in gravitational potentials with a frequency in the nanohertz band, leading to observable effects in the arrival times of radio pulses from pulsars. Unlike scalar dark matter, pulsar timing signals induced by the vector dark matter are dependent on the oscillation direction of the vector fields. In this work, we search for ultralight vector dark matter in the mass range of $[2\times 10^{-24}, 2\times 10^{-22}]{\rm{eV}}$ through its gravitational effect in the Parkes Pulsar Timing Array (PPTA) second data release. Since no statistically significant detection is made, we place $95\%$ upper limits on the local dark matter density as $ρ_{\rm{\tiny{VF}}} \lesssim 5{\rm{GeV/cm^{3}}}$ for $m\lesssim 10^{-23}{\rm{eV}}$. As no preferred direction is found for the vector dark matter, these constraints are comparable to those given by the scalar dark matter search with an earlier 12-year data set of PPTA.
