论文标题
中微子血浆中的重力波和纳米格拉夫信号
Gravitational waves in neutrino plasma and NANOGrav signal
论文作者
论文摘要
Nanograv协作在NHz频率范围内对重力波（GW）信号的最新发现为存在的随机GWS打开了大门。在目前的工作中，我们认为在热致密的不对称血浆中，由于中微子不同物种的数量密度的有限差异引起的不稳定性，可以产生GWS。产生的GW在纳米氏酶观察的灵敏度范围内具有振幅和频率。我们已经表明，通过这种机制产生的GW可能是观察到的纳米格拉夫信号的可能解释之一。我们还讨论了在不均匀的宇宙中微子等离子体中的GW产生，当中微子进入自由流媒体机制时，会产生GW。我们表明，在不均匀的中微子血浆中产生的GWS无法解释观察到的纳米格拉夫信号。我们还使用Nanograv信号计算了磁场强度上的下限，并发现要解释信号，磁场的强度应以MPC长度尺度至少具有至少的值$ \ sim 10^{ - 12} $ g。
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.
