Semicoherent analysis method to search for continuous gravitational waves emitted by ultralight boson clouds around spinning black holes
Semicoherent analysis method to search for continuous gravitational waves emitted by ultralight boson clouds around spinning black holes
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DOI：
10.1103/physrevd.98.103017
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发表时间：
2018-09
影响因子：
5
通讯作者：
S. D’Antonio;C. Palomba;P. Astone;S. Frasca;G. Intini;I. L. Rosa;P. Leaci;S. Mastrogiovanni;A. Miller;F. Muciaccia;O. Piccinni;A. Singhal
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文献类型：
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作者：
S. D’Antonio;C. Palomba;P. Astone;S. Frasca;G. Intini;I. L. Rosa;P. Leaci;S. Mastrogiovanni;A. Miller;F. Muciaccia;O. Piccinni;A. Singhal
由于克尔黑洞中诱导的超辐射不稳定性，超轻玻色子云可以成为持久引力波的来源，目前和未来的引力波探测器可能会探测到这种引力波。这些信号被预测为几乎是单色的，有一个小的稳定的频率增加(自旋)，但考虑到在理论水平上所做的几个假设和简化，从数据分析的观点来看，明智的做法是考虑一种更广泛的引力信号，其中的相位(或频率)在时间上略有漂移。同样，其他类型的源，例如中子星，在物质吸积和持续引力波的发射之间存在扭矩平衡，也属于这一类。在本文中，我们提出了一种稳健且计算成本低廉的分析流水线，专门用于搜索这类信号。我们通过理论上的灵敏度估计和对注入模拟信号的同步数据的分析，提供了该方法的完整表征。讨论了全天搜索和高灵敏度定向搜索的搜索设置。
As a consequence of superradiant instability induced in Kerr black holes, ultra-light boson clouds can be a source of persistent gravitational waves, potentially detectable by current and future gravitational-wave detectors. These signals have been predicted to be nearly monochromatic, with a small steady frequency increase (spin-up), but given the several assumptions and simplifications done at theoretical level, it is wise to consider, from the data analysis point of view, a broader class of gravitational signals in which the phase (or the frequency) slightly wander in time. Also other types of sources, e.g. neutron stars in which a torque balance equilibrium exists between matter accretion and emission of persistent gravitational waves, would fit in this category. In this paper we present a robust and computationally cheap analysis pipeline devoted to the search of such kind of signals. We provide a full characterization of the method, through both a theoretical sensitivity estimation and through the analysis of syntethic data in which simulated signals have been injected. The search setup for both all-sky searches and higher sensitivity directed searches is discussed.