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arXiv 2106.16142gr-qcastro-ph.HE
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天蝎座X-1引力波互相关搜索的模板格

Template Lattices for a Cross-Correlation Search for Gravitational Waves from Scorpius X-1

Katelyn J. Wagner, John T. Whelan, Jared K. Wofford, Karl Wette

摘要:

我们描述的应用程序的晶格覆盖问题的模板在搜索连续引力波从低质量的X射线双星天蝎座X-1的位置。在给定的最大失配下有效放置模板以覆盖参数空间是球体覆盖问题的一个应用,其实现可在LatticeTiling软件库中获得。在Sco X-1的情况下,在轨道周期和轨道相位之间的先验不确定性和失配度量中的潜在相关性导致晶格的有效构造的复杂性。我们定义了一个剪切坐标变换,同时最大限度地减少这两个来源的相关性,并允许我们利用小的前轨道周期的不确定性。由此产生的晶格有一个因素,约3少的模板比相应的参数空间网格构造由先前的直接方法,允许在相同的计算成本和最大失配更敏感的搜索。

英文摘要:

We describe the application of the lattice covering problem to the placement of templates in a search for continuous gravitational waves from the low-mass X-Ray binary Scorpius X-1. Efficient placement of templates to cover the parameter space at a given maximum mismatch is an application of the sphere covering problem, for which an implementation is available in the LatticeTiling software library. In the case of Sco X-1, potential correlations, in both the prior uncertainty and the mismatch metric, between the orbital period and orbital phase, lead to complications in the efficient construction of the lattice. We define a shearing coordinate transformation which simultaneously minimizes both of these sources of correlation, and allows us to take advantage of the small prior orbital period uncertainty. The resulting lattices have a factor of about 3 fewer templates than the corresponding parameter space grids constructed by the prior straightforward method, allowing a more sensitive search at the same computing cost and maximum mismatch.

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