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arXiv 2011.058212020-11astro-ph.COhep-th

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中微子等离子体中的引力波与NANOGrav信号

Gravitational waves in neutrino plasma and NANOGrav signal

Arun Kumar Pandey

备注：: 7 Pages and 1 figures
发表信息：: European Physical Journal C, 81, 399 (2021)
DOI：: 10.1140/epjc/s10052-021-09190-w

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摘要：

最近发现的引力波（GW）信号的NANOGrav合作在nHZ的频率范围内打开了大门的随机GW的存在。在目前的工作中，我们认为，在一个热的密集的中微子不对称等离子体中，GWs可以产生由于不稳定性所造成的有限的差异，在不同种类的中微子的数量密度。所产生的GWs具有在NANOGrav观测的灵敏度范围内的振幅和频率。我们已经表明，由这种机制产生的GWs可能是观测到的NANOGrav信号的可能解释之一。我们还讨论了在非均匀宇宙学中微子等离子体中产生的引力波，其中引力波是当中微子进入自由流态时产生的。我们表明，在非均匀中微子等离子体中产生的GWs不能解释所观察到的NANOGrav信号。我们还使用NANOGrav信号计算了磁场强度的下限，并发现为了解释该信号，磁场强度在Mpc长度尺度下至少应具有值$\sim 10^{-12}$ G。

英文摘要：

The recent finding of the gravitational wave (GW) signal by the NANOGrav collaboration in the nHZ frequency range has opened up the door for the existence of stochastic GWs. In the present work, we have argued that in a hot dense neutrino asymmetric plasma, GWs could be generated due to the instability caused by the finite difference in the number densities of the different species of the neutrinos. The generated GWs have amplitude and frequency in the sensitivity range of the NANOGrav observation. We have shown that the GWs generated by this mechanism could be one of the possible explanations for the observed NANOGrav signal. We have also discussed generation of GWs in an inhomogeneous cosmological neutrino plasma, where GWs are generated when neutrinos enter a free streaming regime. We show that the generated GWs in an inhomogeneous neutrino plasma cannot explain the observed NANOGrav signal. We have also calculated the lower bound on magnetic fields' strength using the NANOGrav signal and found that to explain the signal, the magnetic fields' strength should have atleast value $\sim 10^{-12}$ G at an Mpc length scale.

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