Revisiting magnetogenesis during inflation
Revisiting magnetogenesis during inflation
复制标题
重温暴胀期间的磁生作用
DOI：
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复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
H. Firouzjahi
中科院分区：
文献类型：
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作者：
Alireza Talebian;Amin Nassiri;H. Firouzjahi
通过考虑电磁扰动随机噪声的动力学，我们重新审视了暴胀过程中的原始磁生机制。我们得到相关的朗之万和福克-普朗克方程的电磁场，并解决他们的解析。结果表明，虽然电场能量密度的反作用可能过早地破坏通货膨胀，但也有一些区域的参数空间中，通常的衰减行为的磁场被替换为平均回复过程的随机动力学。结果，磁场稳定到平衡状态，其幅度明显大于在没有随机噪声的情况下获得的幅度。我们证明了具有当前时间振幅为10^{-13}$高斯和相干长度${
当电场扰动的逆反应在控制之下时，可以产生m Mpc}$。
We revisit the mechanism of primordial magnetogenesis during inflation by taking into account the dynamics of the stochastic noises of the electromagnetic perturbations. We obtain the associated Langevin and Fokker-Planck equations for the electromagnetic fields and solve them analytically. It is shown that while the backreactions of the electric field energy density may spoil inflation too early, but there are regions of parameter space where the usual decaying behavior of the magnetic fields are replaced by a mean-reverting process of stochastic dynamics. As a result, the magnetic fields settle down into an equilibrium state with the amplitude significantly larger than what is obtained in the absence of the stochastic noises. We show that magnetic fields with present time amplitude $sim 10^{-13}$ Gauss and coherent length ${
m Mpc}$ can be generated while the backreactions of the electric field perturbations are under control.
超高能宇宙线各向异性对河外磁场强度的上限
DOI：
10.3847/1538-4357/aac777
发表时间：
2018
期刊：
The Astrophysical Journal
影响因子：
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作者：
Bray J
通讯作者：
Bray J