arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11066gr-qcastro-ph.COhep-phhep-th
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暴胀过程中的磁成因

Revisiting Magnetogenesis during Inflation

Alireza Talebian, Amin Nassiri-Rad, Hassan Firouzjahi

摘要:

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破坏通货膨胀,但也有通常的衰减行为的磁场的参数空间的区域被随机动力学的均值回复过程所取代。结果,磁场稳定到平衡态,其幅度明显大于在没有随机噪声的情况下获得的幅度。结果表明,在控制电场扰动的反作用的同时,可以产生当前时间振幅为$\sim 10^{-13}$高斯、相干长度为${\rm Mpc}$的磁场.

英文摘要:

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 ${\rm Mpc}$ can be generated while the backreactions of the electric field perturbations are under control.

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