来自QCD-轴子超致密小暗晕的多信使信号
Multi-messenger signal from QCD-Axion Ultracompact Minihalos
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中文总结 AI 辅助
本研究探索由恒星质量原初黑洞种子、QCD-轴子暗物质构成的超致密小暗晕的多信使信号，通过引力波与射电信号联合检验混合暗 sector。
中文摘要 AI 辅助
我们探索由恒星质量原初黑洞（PBHs）种子、由QCD-轴子暗物质构成的超致密小暗晕（UCMHs）产生的多信使特征。采用次吸积框架，结合前暴胀佩切伊-奎因（Peccei-Quinn）场景的遗迹丰度与等曲率条件，数值重现特征暗晕轮廓，并对最内区域采用保守的常数密度核。我们研究这些致密结构内中子星-原初黑洞并合产生的引力波与电磁信号：动力学摩擦使引力波相对于真空双黑洞产生相位偏移，对于质量≤10倍太阳质量（10M⊙）的原初黑洞，该偏移可由激光干涉空间天线（LISA）观测到；同时，引力聚焦的轴子可在中子星磁层中共振转换为光子，产生窄带射电特征，对于银河系邻近中子星，绿岸射电望远镜（GBT）的预期灵敏度可探测到μeV质量范围的QCD-轴子带。因此，引力波可探测超致密小暗晕的存在与结构，而射电信号可探测其暗物质的粒子属性，二者联合观测为混合暗 sector 提供了独特的检验手段。
英文摘要
We explore the multimessenger signatures from ultracompact minihalos (UCMHs) seeded by stellar-mass primordial black holes (PBHs) and composed of QCD-axion dark matter. Using the secondary-infall framework, with relic-abundance and isocurvature conditions from a pre-inflationary Peccei-Quinn scenario, we numerically recover the characteristic halo profile and adopt a conservative constant-density core for the innermost region. We study the gravitational wave and electromagnetic signatures from neutron-star-PBH inspirals inside these dense structures. Dynamical friction produces a gravitational-wave dephasing relative to the vacuum binary, observable with LISA for primordial black holes with masses $\lesssim\! 10M_\odot$. Simultaneously, gravitationally focused axions can resonantly convert into photons in the neutron-star magnetosphere, producing a narrow-band radio signature. For nearby galactic neutron stars, the projected sensitivity of the Green Bank radio telescope GBT captures the QCD-axion band in the $μ{\rm eV}$ mass range. Gravitational waves therefore probe the presence and structure of the UCMH, while the radio signal probes the particle nature of its dark matter, making their joint observation a distinctive test of a mixed dark sector.
