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arXiv 2403.04832astro-ph.HEastro-ph.GAgr-qc
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毫赫兹波段高偏心恒星质量双星的随机引力波背景

Stochastic Gravitational Wave Background from Highly-Eccentric Stellar-Mass Binaries in the Milli-hertz Band

UCLA(加州大学洛杉矶分校);Mani L. Bhaumik Institute for Theoretical Physics, Department of Physics and Astronomy, UCLA(加州大学洛杉矶分校物理与天文学系马尼·L·巴乌米克理论物理研究所);Rudolf Peierls Centre for Theoretical Physics, Parks Road, Oxford(牛津大学鲁道夫·派尔斯理论物理中心)

Zeyuan Xuan, Smadar Naoz, Bence Kocsis, Erez Michaely

AI总结:

本文研究了毫赫兹波段高偏心(e≥0.9)恒星质量双星产生的随机引力波背景,发现其功率谱可能超过LISA仪器噪声,且主要由银河系内源主导,但通过有效搜索策略可将不可分辨噪声降低约两个数量级。

摘要:

许多引力波源在毫赫兹波段预期具有不可忽略的偏心率。这些高偏心致密双星通常作为引力波并合的前身阶段,特别是在动力学通道中,环境扰动使初始轨道间隔较大的双星进入近心点近距离通过,导致高效的引力波辐射并最终并合。本文研究了毫赫兹波段高偏心(e≥0.9)恒星质量源的随机引力波背景。我们的发现表明,这些双星可以贡献显著的引力波功率谱,在约3-7毫赫兹可能超过LISA仪器噪声。该随机背景很可能由银河系内的偏心源主导,从而在LISA探测中引入各向异性和时间依赖性。然而,考虑到识别高偏心双星引力波瞬变信号的有效搜索策略,不可分辨的噪声水平可以显著降低,达到低于LISA噪声曲线约两个数量级。因此,我们强调表征极端偏心恒星质量引力波源的重要性,特别是它们在毫赫兹波段的瞬变引力波信号。

英文摘要:

Many gravitational wave (GW) sources are expected to have non-negligible eccentricity in the millihertz band. These highly eccentric compact object binaries may commonly serve as a progenitor stage of GW mergers, particularly in dynamical channels where environmental perturbations bring a binary with large initial orbital separation into a close pericenter passage, leading to efficient GW emission and a final merger. This work examines the stochastic GW background from highly eccentric ($e\gtrsim 0.9$), stellar-mass sources in the mHz band. Our findings suggest that these binaries can contribute a substantial GW power spectrum, potentially exceeding the LISA instrumental noise at $\sim 3-7$~mHz. This stochastic background is likely to be dominated by eccentric sources within the Milky Way, thus introducing anisotropy and time dependence in LISA's detection. However, given efficient search strategies to identify GW transients from highly eccentric binaries, the unresolvable noise level can be substantially lower, approaching $\sim 2$ orders of magnitude below the LISA noise curve. Therefore, we highlight the importance of characterizing stellar-mass GW sources with extreme eccentricity, especially their transient GW signals in the millihertz band.

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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