发表机构
State Key Laboratory of Radio Astronomy and Technology, National Astronomical Observatories, CAS; School of Astronomy and Space Science, University of Chinese Academy of Sciences; Asia Pacific Center for Theoretical Physics (APCTP); National Astronomical Observatories, Chinese Academy of Sciences; Department of Astronomy, School of Physics and Materials Science, Guangzhou University（中国科学院国家天文台射电天文与技术重点实验室; 中国科学院大学天文与空间科学学院; 亚太理论物理中心; 中国科学院国家天文台; 广州大学物理与材料科学系天文学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文利用贝叶斯框架分析三个活跃重复快速射电暴的偏振数据，结合地球项关联构建偏振阵列，未发现类轴子暗物质信号，并在10^-23至10^-18 eV质量范围给出Chern-Simons耦合的95%置信上限，证明长期偏振监测是探测类轴子暗物质的独立有效途径。
AI 中文摘要
类轴子暗物质（ALDM）是一个动机充分的暗物质候选者，其与光子的Chern-Simons耦合可以诱发宇宙双折射，在不同来源的偏振角（PA）信号中产生时间振荡和空间关联。具有高线偏振度的活跃重复快速射电暴（FRB）是探测此类信号的特别有前景的探针。我们开发了一个贝叶斯框架，用于在单个重复FRB中搜索由ALDM引起的PA振荡，并通过利用共同地球项产生的关联，将多个源组合成FRB偏振阵列（FRBPA）。我们将此框架应用于三个研究充分的活跃重复FRB的PA数据集，并在广泛的ALDM质量范围内约束Chern-Simons耦合。对于每个FRB，我们使用模拟校准的暗物质晕轮廓估计其宿主位置的暗物质密度。推断的暗物质密度与基准局部密度$\rho_0 = 0.4~\mathrm{GeV/cm^3}$相当。源和地球暗物质密度的相当性，以及红移引起的源项和地球项频率之间的差异，促使我们采用完整的双分量双折射模型。我们在单个源分析和联合FRBPA分析中均未发现ALDM诱导的PA振荡的有力证据。我们给出了Chern-Simons耦合强度作为ALDM质量函数的95%置信上限。在轴子质量从$10^{-23}$到$10^{-18}~\mathrm{eV}$范围内，FRBPA的耦合强度上限介于$10^{-12.6}$和$10^{-7.9}~\mathrm{GeV}^{-1}$之间。我们的结果确立了长期偏振监测活跃重复FRB作为ALDM的一个有前景且独立的探针，其灵敏度预计将随着更长的观测基线和更大的源样本而提高。
英文摘要
Axion-like dark matter (ALDM) is a well-motivated dark matter candidate whose Chern-Simons coupling to photons can induce cosmic birefringence, producing temporal oscillations and spatial correlation in polarization angle (PA) signals from different sources. Hyperactive repeating fast radio bursts (FRBs) with high linear polarization are a particularly promising probe of such signatures. We develop a Bayesian framework to search for PA oscillations caused by ALDM in individual repeating FRBs, and combine multiple sources in an FRB polarization array (FRBPA) by exploiting correlations arising from the common Earth term. We apply this framework to PA datasets from three well-studied hyperactive repeating FRBs, and constrain the Chern-Simons coupling over a broad range of ALDM masses. For each FRB, we estimate the dark matter density at its host location using a simulation-calibrated halo profile. The inferred dark matter densities are comparable to the fiducial local density $ρ_0 = 0.4~\mathrm{GeV/cm^3}$. The comparable source and Earth dark matter densities, together with the redshift-induced difference between the frequencies of the source and Earth terms, motivate our adoption of the full two-component birefringence model. We find no compelling evidence for ALDM-induced PA oscillations in either the individual source analyses or the joint FRBPA analysis. We place 95\% credible upper limits on the Chern-Simons coupling strength as a function of ALDM mass. Across the axion mass from $10^{-23}$ to $10^{-18}~\mathrm{eV}$, the resulting upper limits of the coupling strength of FRBPA lie between $10^{-12.6}$ and $10^{-7.9}~\mathrm{GeV}^{-1}$. Our results establish long-term polarimetric monitoring of hyperactive repeating FRBs as a promising and independent probe of ALDM, with sensitivity expected to improve with longer observational baselines and larger source samples.
Comments23 pages, 4 figures
