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arXiv 2203.15440gr-qcastro-ph.COhep-th
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引力波非线性和脉冲星定时阵列角相关

Gravitational wave non-linearities and pulsar-timing array angular correlations

Gianmassimo Tasinato

摘要:

几个脉冲星定时阵列(PTA)的合作正在寻找一个在纳赫兹制度的随机引力波背景信号诱人的线索。然而,到目前为止,还没有令人信服的证据来证明预期的海林斯-唐斯四极相关。虽然这个问题可能会得到解决,在更准确的,即将到来的数据的光,重要的是要保持眼睛打开不同的可能性,并探索能够产生不同类型的PTA角相关的方案。我们指出,一个平稳的非高斯分量的引力波背景可以调制的2点PTA重叠减少功能,添加的贡献,可以帮助在拟合的PTA数据的角分布。我们讨论了这种非高斯信号的可能来源,在宇宙膨胀结束后发生的过程,我们调查进一步测试这个想法。

英文摘要:

Several pulsar-timing array (PTA) collaborations are finding tantalising hints for a stochastic gravitational wave background signal in the nano-Hertz regime. So far, though, no convincing evidence for the expected Hellings-Downs quadrupolar correlations has been found. While this issue might get fixed at the light of more accurate, forthcoming data, it is important to keep an eye open on different possibilities, and explore scenarios able to produce different types of PTA angular correlations. We point out that a stationary non-Gaussian component to the gravitational wave background can modulate the 2-point PTA overlap reduction function, adding contributions that can help in fitting the angular distribution of PTA data. We discuss possible sources for such non-Gaussian signal in terms of cosmological processes occurring after inflation ends, and we investigate further tests for this idea.

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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