利用PPTA与QUIJOTE脉冲星偏振测量搜寻暗物质波
Searching for dark-matter waves with PPTA and QUIJOTE pulsar polarimetry
AI总结：
本文利用广义Lomb-Scargle周期图分析QUIJOTE和PPTA的脉冲星偏振数据，并考虑轴子场随机性，在10⁻²³–10⁻¹⁹ eV质量范围内获得了轴子-光子耦合的最强限制，并展望了未来脉冲星偏振测量的探测潜力。
摘要：
天体物理源发射的光子偏振可能在穿过由超轻类轴子粒子（ALPs）构成的暗物质介质时发生改变。特别是，银河晕中ALP背景的相干振荡会对脉冲星等局域源发射的电磁辐射偏振产生周期性调制。在以往工作的基础上，我们开发了一种新的、更稳健的基于广义Lomb-Scargle周期图的分析方法，用于在QUIJOTE MFI仪器观测的蟹状星云超新星遗迹以及来自Parkes脉冲星计时阵列（PPTA）项目的20颗银河系脉冲星的辐射中搜寻这一周期信号。我们还仔细考虑了轴子场的随机性质，这一效应在以往的工作中常常被忽略。这种改进后的分析在覆盖$10^{-23}\text{ eV}\lesssim m_a\lesssim10^{-19} \text{ eV}$的宽暗物质质量范围内给出了对轴子-光子耦合的最强限制。最后，我们考察了可能的最佳观测目标，以及未来利用脉冲星偏振测量在该质量范围内对轴子型暗物质可能达到的探测灵敏度。
英文摘要：
The polarization of photons emitted by astrophysical sources might be altered as they travel through a dark matter medium composed of ultra light axion-like particles (ALPs). In particular, the coherent oscillations of the ALP background in the galactic halo induce a periodic change on the polarization of the electromagnetic radiation emitted by local sources such as pulsars. Building up on previous works, we develop a new, more robust, analysis based on the generalised Lomb-Scargle periodogram to search for this periodic signal in the emission of the Crab supernova remnant observed by the QUIJOTE MFI instrument and 20 galactic pulsars from the Parkes Pulsar Timing Array (PPTA) project. We also carefully take into account the stochastic nature of the axion field, an effect often overlooked in previous works. This refined analysis leads to the strongest limits on the axion-photon coupling for a wide range of dark matter masses spanning $10^{-23}\text{ eV}\lesssim m_a\lesssim10^{-19} \text{ eV}$. Finally, we survey possible optimal targets and the potential sensitivity to axionic dark-matter in this mass range that could be achieved using pulsar polarimetry in the future.
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