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arXiv 1706.05097gr-qcastro-ph.HEhep-phhep-th
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超轻玻色子产生的随机可分辨引力波

Stochastic and resolvable gravitational waves from ultralight bosons

Richard Brito, Shrobana Ghosh, Enrico Barausse, Emanuele Berti, Vitor Cardoso, Irina Dvorkin, Antoine Klein, Paolo Pani

摘要:

旋转黑洞周围的超轻标量场可以引发超辐射不稳定性,在视界外形成长寿的玻色子凝聚体。我们使用数值解的扰动场方程和天体物理模型的大规模和恒星质量的黑洞人口计算,第一次,随机引力波背景从这些来源。在乐观的情况下,先进的LIGO和LISA观测到的背景场质量$m_s$的范围$\sim [2\times 10^{-13}, 10^{-12}]\,{\rm eV}$和$\sim 5\times[ 10^{-19}, 10^{-16}]\,{\rm eV}$,分别,它可以影响可分辨源的可探测性。我们的估计表明,对LIGO O1的随机背景限制的分析可能已经被用来勉强排除质量为$\sim 10^{-12.5}{\rm eV}$的轴子。使用高级LIGO(LISA)的半相干搜索应该检测标量场质量$3\times 10^{-13}$($10^{-17}$)eV的$\sim 15~(5)$到$200~(40)$可分辨源。大质量BH自旋的激光束散射测量可以排除$\sim [10^{-18}, 2\times 10^{-13}]$ eV范围内的玻色子,也可以在$\sim[10^{-17}, 10^{-13}]$ eV范围内以10%的精度测量$m_s$。

英文摘要:

Ultralight scalar fields around spinning black holes can trigger superradiant instabilities, forming a long-lived bosonic condensate outside the horizon. We use numerical solutions of the perturbed field equations and astrophysical models of massive and stellar-mass black hole populations to compute, for the first time, the stochastic gravitational-wave background from these sources. In optimistic scenarios the background is observable by Advanced LIGO and LISA for field masses $m_s$ in the range $\sim [2\times 10^{-13}, 10^{-12}]\,{\rm eV}$ and $\sim 5\times[ 10^{-19}, 10^{-16}]\,{\rm eV}$, respectively, and it can affect the detectability of resolvable sources. Our estimates suggest that an analysis of the stochastic background limits from LIGO O1 might already be used to marginally exclude axions with mass $\sim 10^{-12.5}{\rm eV}$. Semicoherent searches with Advanced LIGO (LISA) should detect $\sim 15~(5)$ to $200~(40)$ resolvable sources for scalar field masses $3\times 10^{-13}$ ($10^{-17}$) eV. LISA measurements of massive BH spins could either rule out bosons in the range $\sim [10^{-18}, 2\times 10^{-13}]$ eV, or measure $m_s$ with ten percent accuracy in the range $\sim[10^{-17}, 10^{-13}]$ eV.

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