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arXiv 2602.15065astro-ph.HEhep-ph
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中子星双星早期共振轴子-光子转换

Resonant Axion-Photon Conversion in the Early Inspiral of Neutron Star Binaries

University of Salamanca(萨拉曼卡大学)

D. Suárez-Fontanella, M. Ángeles Pérez-García, C. Albertus

AI总结:

研究双中子星 inspiral 阶段中轴子-光子共振转换的机制及其在射电观测中的潜在探测价值。

摘要:

我们考虑早期双中子星 inspiral 阶段作为探测环境轴子-光子共振转换的场景。为此,我们近似将并合地点的电磁场建模为两个旋转双极磁层磁场的叠加,当两个磁层未显著扭曲时,在千公里尺度上。我们捕捉了与轴子-光子混合相关的近区磁层几何结构。通过有效的 Goldreich-Julian 电荷密度,纳入等离子体效应,以确定有效等离子体频率和共振转换表面的位置。我们的结果表明,双星磁层中的轴子-光子共振转换主要发生在扩展的豌豆形表面,其全球几何结构随着双星 inspiral 的演变而变化。因此,通过轴子-光子转换发射的总电磁功率表现出对轴子质量的特征依赖性,并与引力波频率发射存在慢速时间调制。这一特征可能在 $m_a \in [50,170] \,\rm μeV$ 和 $g_{a γ} \lesssim 10^{-11}\rm \,GeV^{-1}$ 范围内被检测到,因为其处于当前或计划的射电观测任务的灵敏度范围内。鉴于我们的结果,我们讨论双中子星 inspiral 作为时间依赖、多信使轴子物理探测的机会,并鼓励结合引力波观测与射电和毫米波电磁测量的联合搜索。

英文摘要:

We consider the early binary neutron star inspiral phase as a scenario to probe environmental axion--photon resonant conversion. For this we approximately model the merger site electromagnetic fields as the superposition of two rotating dipolar stellar magnetic fields at the thousand--km scale when both magnetospheres are not largely distorted. We capture the time-sliced near-zone magnetospheric geometry relevant for axion--photon mixing. Plasma effects are incorporated through an effective Goldreich--Julian charge density, used to determine the effective plasma frequency and the location of resonant conversion surfaces. Our results show that axion--photon resonant conversion in binary magnetospheres mostly occurs on extended peanut-shaped surfaces whose global geometry evolves as the binary inspiral evolves. As a consequence, the total electromagnetic power emitted through axion--photon conversion exhibits a characteristic dependence on axion mass and a slow temporal modulation correlated with the gravitational wave frequency emission. This feature is potentially detectable for $m_a \in [50,170] \,\rm μeV$ and set $g_{a γ} \lesssim 10^{-11}\rm \,GeV^{-1}$ as it lies within the sensitivity limits of current or planned radio observation missions. In light of our results we discuss the opportunity of binary neutron star inspirals as time-dependent, multimessenger probes of axion physics, and motivate coordinated searches combining gravitational wave observations with radio and millimeter wavelength electromagnetic measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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