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arXiv 2307.08552gr-qcastro-ph.CO
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PTA数据的标量诱导引力波解释:标量涨落传播速度的作用

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

Shyam Balaji, Guillem Domènech, Gabriele Franciolini

AI总结:

针对PTA观测到的nHz引力波背景与原初黑洞过产之间的矛盾,本文提出以高传播速度、辐射物态的正则标量场主导宇宙来调和二者,并给出未来探测器检验途径。

摘要:

脉冲星计时阵列收集到了在nHz频率附近存在引力波背景的证据。如果该引力波背景由大的高斯原初涨落诱导产生,那么它们将生成过多的亚太阳质量原初黑洞。我们表明,如果在引力波产生时宇宙由一个正则标量场主导,该标量场具有与标准辐射相同的物态方程,但涨落具有更高的传播速度,那么人们就可以在原初黑洞对应物与观测相符的情况下解释该引力波背景。最后,我们讨论了利用未来引力波探测器检验这一模型的可能方法。

英文摘要:

Pulsar timing arrays gathered evidence of the presence of a gravitational wave background around nHz frequencies. If the gravitational wave background was induced by large and Gaussian primordial fluctuations, they would then produce too many sub-solar mass primordial black holes. We show that if at the time of gravitational wave generation the universe was dominated by a canonical scalar field, with the same equation of state as standard radiation but a higher propagation speed of fluctuations, one can explain the gravitational wave background with a primordial black hole counterpart consistent with observations. Lastly, we discuss possible ways to test this model with future gravitational wave detectors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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