Comparison of cosmic string and superstring models to NANOGrav 12.5-year results
Comparison of cosmic string and superstring models to NANOGrav 12.5-year results
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DOI：
10.1103/physrevd.103.103512
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发表时间：
2021-02
影响因子：
5
通讯作者：
J. Blanco-Pillado;K. Olum;Jeremy M. Wachter
中科院分区：
文献类型：
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作者：
J. Blanco-Pillado;K. Olum;Jeremy M. Wachter
我们比较了几种模型的宇宙弦的随机引力波背景的频谱与最近报道的NANOGrav的共同频谱过程。我们讨论了在计算这样的背景理论的不确定性，并表明，尽管这样的不确定性，宇宙弦仍然是一个很好的解释的潜在信号，但宇宙弦参数的后果取决于模型。超弦也可以解释这个信号，但只能在一个受限的参数空间中，在那里它们的网络行为与普通宇宙弦的网络行为在本质上是相同的。
We compare the spectrum of the stochastic gravitational wave background produced in several models of cosmic strings with the common-spectrum process recently reported by NANOGrav. We discuss theoretical uncertainties in computing such a background, and show that despite such uncertainties, cosmic strings remain a good explanation for the potential signal, but the consequences for cosmic string parameters depend on the model. Superstrings could also explain the signal, but only in a restricted parameter space where their network behavior is effectively identical to that of ordinary cosmic strings.