arXiv 1201.31762012-01-16astro-ph.IMastro-ph.COgr-qc

在LIGO和Virgo数据中连续引力波信号和随机背景的反演

Searches for continuous gravitational wave signals and stochastic backgrounds in LIGO and Virgo data

C. Palomba

备注：: 9 pages, 4 figures, proceedings of the Recontres de Moriond, 2011 (in press)

摘要：

我们目前的结果，从最近的LIGO和处女座的数据连续引力波信号（CW）的旋转中子星和随机引力波背景（SGWB）的搜索。演讲的第一部分是专门讨论CW分析，重点是两种类型的搜索。在已知中子星的有针对性的搜索中，使用恒星参数的精确知识来应用最优滤波方法。在没有信号检测的情况下，在少数情况下，可以设置应变幅度的上限，该上限超过了将自旋下降能量损失归因于引力波发射而得出的自旋下降极限。相比之下，盲全天搜索并不针对特定的源，而是尽可能地探索参数空间的大部分。完全相干的方法不能用于这类搜索，这带来了非平凡的计算挑战。演讲的第二部分重点是SGWB搜索。一个随机的引力波背景是由许多宇宙学或天体物理学起源的非相干源叠加而产生的。鉴于这种信号的随机性，不可能使用单个检测器将其与噪声区分开。典型的数据分析策略依赖于将来自一对或几对检测器的数据互相关，这允许将搜索的信号与仪器噪声区分开。还讨论了这两种源的下一代干涉仪的预期灵敏度和探测前景。

英文摘要：

We present results from searches of recent LIGO and Virgo data for continuous gravitational wave signals (CW) from spinning neutron stars and for a stochastic gravitational wave background (SGWB). The first part of the talk is devoted to CW analysis with a focus on two types of searches. In the targeted search of known neutron stars a precise knowledge of the star parameters is used to apply optimal filtering methods. In the absence of a signal detection, in a few cases, an upper limit on strain amplitude can be set that beats the spindown limit derived from attributing spin-down energy loss to the emission of gravitational waves. In contrast, blind all-sky searches are not directed at specific sources, but rather explore as large a portion of the parameter space as possible. Fully coherent methods cannot be used for these kind of searches which pose a non trivial computational challenge. The second part of the talk is focused on SGWB searches. A stochastic background of gravitational waves is expected to be produced by the superposition of many incoherent sources of cosmological or astrophysical origin. Given the random nature of this kind of signal, it is not possible to distinguish it from noise using a single detector. A typical data analysis strategy relies on cross-correlating the data from a pair or several pairs of detectors, which allows discriminating the searched signal from instrumental noise. Expected sensitivities and prospects for detection from the next generation of interferometers are also discussed for both kind of sources.

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摘要：

英文摘要：

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