论文标题
早期宇宙中QCD相变的MHD湍流中的纳米GRAV信号
NANOGrav signal from MHD turbulence at QCD phase transition in the early universe
论文作者
论文摘要
Nanograv协作最近报道了1-100 NHz频率范围内存在随机重力波背景的证据。我们认为，这种背景本可以是通过QCD量表以磁流动力（MHD）的湍流产生的。从纳米级测量值中可以推断出磁场参数：在QCD相变时代处的磁场强度接近Microgauss和接近Hubble半径的10 \％的相关长度。我们指出，具有此类参数的非螺旋磁场的湍流衰减会导致重组时期的磁场，如最近提出的那样，这将足够强，可以为哈勃张力问题提供解决方案。我们还表明，可以通过测量大规模结构的空隙中的遗物磁场来测量纳米级信号的MHD湍流解释，并具有γ射线望远镜（如CTA）。
The NANOGrav collaboration has recently reported evidence for the existence of a stochastic gravitational wave background in the 1-100 nHz frequency range. We argue that such background could have been produced by magneto-hydrodynamic (MHD) turbulence at the QCD scale. From the NANOGrav measurement one can infer the magnetic field parameters: comoving field strength close to microGauss and a correlation length close to 10\% of the Hubble radius at the QCD phase transition epoch. We point out that the turbulent decay of a non-helical magnetic field with such parameters leads to a magnetic field at the recombination epoch, which would be sufficiently strong to provide a solution to the Hubble tension problem, as recently proposed. We also show that the MHD turbulence interpretation of the NANOGrav signal can be tested via measurements of the relic magnetic field in the voids of the large scale structure, with gamma-ray telescopes like CTA.
