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arXiv 0705.2851gr-qcastro-phhep-ph
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原始随机引力波背景的有效搜索模板

Effective Search Templates for a Primordial Stochastic Gravitational Wave Background

Takeshi Chiba, Yoshiaki Himemoto, Masahide Yamaguchi, Jun'ichi Yokoyama

摘要:

计算了随机引力波背景在振幅接近探测阈值时频谱急剧衰减的极端情况下的信噪比。这样的光谱特征是相对论自由度数量变化在早期宇宙暴胀过程中产生的随机背景上的特征印记。我们发现,虽然SNR是最大的与假设的真实频谱成比例的正确的模板,它的模板的形状的敏感性是相当弱的,表明一个简单的幂律模板是足够的检测签名。

英文摘要:

We calculate the signal-to-noise ratio (SNR) of the stochastic gravitational-wave background in an extreme case that its spectrum has a sharp falloff with its amplitude close to the detection threshold. Such a spectral feature is a characteristic imprint of the change in the number of relativistic degrees of freedom on the stochastic background generated during inflation in the early Universe. We find that, although SNR is maximal with the correct template which is proportional to the assumed real spectrum, its sensitivity to the shape of template is fairly weak indicating that a simple power-law template is sufficient to detect the signature.

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