Relic Gravitational Waves from the Chiral Magnetic Effect
Relic Gravitational Waves from the Chiral Magnetic Effect
复制标题
来自手性磁效应的遗迹引力波
DOI：
10.3847/1538-4357/abe4d7
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
J. Schober
中科院分区：
文献类型：
--
作者：
A. Brandenburg;Yutong He;T. Kahniashvili;M. Rheinhardt;J. Schober
遗迹引力波（GWs）可以由原始磁场产生。然而，不太知道所产生的GW振幅和它们的生成机制的细节的依赖。在这里，我们通过手征磁效应（CME）作为一个通用的机制，并探讨其依赖于生成速度（磁扩散率和特征波数的乘积）和速度表征的最大磁场强度预期从CME的磁场产生。当后者超过前者（制度I），这是适用于早期宇宙的制度，我们得到一个逆级联与中等GW的能量，规模与磁能的三次方。当发电速度超过CME极限（状态II）时，GW能量继续增加，而磁能没有相应的增加。在早期的运动学阶段，GW的能量谱（每线性波数间隔）具有相反的斜率，在这两个政权，其特征在于由一个惯性范围谱在政权I和白色噪声谱在政权II。这两个斜坡的发生被证明是一个通用的后果，近单色指数增长的磁场。由此产生的GW能量被发现是成比例的限制CME速度的五次方和发电速度的一次方。
Relic gravitational waves (GWs) can be produced by primordial magnetic fields. However, not much is known about the resulting GW amplitudes and their dependence on the details of the generation mechanism. Here we treat magnetic field generation through the chiral magnetic effect (CME) as a generic mechanism and explore its dependence on the speed of generation (the product of magnetic diffusivity and characteristic wavenumber) and the speed characterizing the maximum magnetic field strength expected from the CME. When the latter exceeds the former (regime I), which is the regime applicable to the early universe, we obtain an inverse cascade with moderate GW energy that scales with the third power of the magnetic energy. When the generation speed exceeds the CME limit (regime II), the GW energy continues to increase without a corresponding increase of magnetic energy. In the early kinematic phase, the GW energy spectrum (per linear wavenumber interval) has opposite slopes in both regimes and is characterized by an inertial range spectrum in regime I and a white noise spectrum in regime II. The occurrence of these two slopes is shown to be a generic consequence of a nearly monochromatic exponential growth of the magnetic field. The resulting GW energy is found to be proportional to the fifth power of the limiting CME speed and the first power of the generation speed.
DOI：
10.1088/1475-7516/2020/03/024
发表时间：
2020-03-01
影响因子：
6.4
作者：
Caprini, Chiara;Chala, Mikael;Weir, David J.
通讯作者：
Weir, David J.