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arXiv 2307.04419gr-qcastro-ph.CO
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利用脉冲星计时阵列对原初曲率功率谱的限制

Constraints on primordial curvature power spectrum with pulsar timing arrays

Zhi-Qiang You, Zhu Yi, You Wu

AI总结:

该研究利用脉冲星计时阵列数据,通过贝叶斯推断比较单峰与双峰参数化的原初曲率功率谱模型,发现当前灵敏度无法区分不同形状,从而限制了原初曲率功率谱的约束。

摘要:

NANOGrav、PPTA、EPTA和CPTA探测到的随机信号可以用标量诱导引力波来解释。为了确定最适合该随机信号的标量诱导引力波模型,我们对原初曲率扰动的功率谱采用了单峰和双峰两种参数化形式,其中单峰情形包括δ函数、箱型、对数正态和破缺幂律模型,双峰情形则用双对数正态形式描述。通过贝叶斯推断,我们发现单峰情形相对于双峰模型没有显著的支持或反对证据,这些模型之间的对数贝叶斯因子ln B < 1。因此,在脉冲星计时阵列当前的灵敏度下,我们无法区分原初曲率扰动功率谱的不同形状。

英文摘要:

The stochastic signal detected by NANOGrav, PPTA, EPTA, and CPTA can be explained by the scalar-induced gravitational waves. In order to determine the scalar-induced gravitational waves model that best fits the stochastic signal, we employ both single- and double-peak parameterizations for the power spectrum of the primordial curvature perturbations, where the single-peak scenarios include the $δ$-function, box, lognormal, and broken power law model, and the double-peak scenario is described by the double lognormal form. Using Bayesian inference, we find that there is no significant evidence for or against the single-peak scenario over the double-peak model, with $\log$ (Bayes factors) among these models $\ln \mathcal{B} < 1$. Therefore, we cannot distinguish the different shapes of the power spectrum of the primordial curvature perturbation with the current sensitivity of pulsar timing arrays.

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