论文标题
宇宙微波背景上的螺旋磁场重组后的重组耗散的烙印
Imprints of the post recombination dissipation of helical magnetic field on the Cosmic Microwave Background Radiation
论文作者
论文摘要
天体物理磁场主要通过两个过程，即双极扩散和湍流。在文献中，通过上述过程对宇宙微波背景（CMB）辐射的影响，在文献中较早地得出了对非螺旋磁场的强度和光谱指数的约束。磁场的螺旋成分也是在各种磁化模型中产生的，可以解释较大的相干长度磁场。在这项研究中，我们专注于研究通过双极扩散和衰减磁性湍流的最大螺旋磁场后重组衰变的影响，以及该衰变对CMB的影响。我们发现螺旋磁场会导致重子温度和电离分数的演变变化，从而导致CMB温度和极化各向异性的改变。这些修饰与由于非螺旋磁场而产生的修饰不同，其变化取决于磁场功率光谱的强度和光谱指数。
Astrophysical magnetic fields decay primarily via two processes namely, ambipolar diffusion and turbulence. Constraints on the strength and the spectral index of non-helical magnetic fields have been derived earlier in the literature through the effect of the above mentioned processes on the Cosmic Microwave Background (CMB) radiation. A helical component of the magnetic field is also produced in various models of magnetogenesis, which can explain larger coherence length magnetic field. In this study, we focus on studying the effects of post recombination decay of maximally helical magnetic fields through ambipolar diffusion and decaying magnetic turbulence and the impact of this decay on CMB. We find that helical magnetic fields lead to changes in the evolution of baryon temperature and ionization fraction which in turn lead to modifications in the CMB temperature and polarization anisotropy. These modifications are different from those arising due to non-helical magnetic fields with the changes dependent on the strength and the spectral index of the magnetic field power spectra.
