标题： 有效搜索模板用于原初随机引力波背景 显示英文标题

标题： Effective Search Templates for a Primordial Stochastic Gravitational Wave Background

摘要： 我们计算了在极端情况下随机引力波背景的信噪比（SNR），其谱具有急剧下降的特征，其振幅接近检测阈值。 这种光谱特征是早期宇宙暴胀期间产生的随机背景中相对论自由度数量变化的特征性印记。 我们发现，尽管使用与假设的真实谱成比例的正确模板时SNR最大，但其对模板形状的敏感性相当弱，表明简单的幂律模板就足以检测到这一特征。 显示英文摘要

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.