论文标题
磁场耗散对原始液丰度的影响
Effect of Magnetic Field Dissipation on Primordial Li Abundance
论文作者
论文摘要
研究原始磁场对原始元素丰度的耗散作用。当磁场重新连接时，其能量将转换为带电颗粒的动能，如太阳能颗粒到达地球上所观察到的那样。这加速了宇宙背景核，而能量核会诱导非热反应。耗散的限制是从大爆炸核合成期间非热反应的理论计算得出的。我们发现，如果在电子 - 邻苯大州歼灭时期使用0.01--0.1％的宇宙能量密度，可以解释对LI和D丰度的观察结果。这种磁场幅度的重新连接产生了外向的喷气机，其大体速度演变为适合宇宙射线（CR）核能的值，为成功的Cr核合成所需的0.1--1 MEV。因此，原始磁场耗散期间宇宙背景核的加速度是软CRS的可能产生机制，已被建议作为解决宇宙LI问题的解决方案。在没有外来物理的建议的解决方案中，此处建议的耗散磁场模型仅解释了低Li和高d丰度的观察结果。我们的结果表明，在原始元素丰度中已经观察到了早期宇宙中强磁场的特征。
The dissipation effects of primordial magnetic fields on the primordial elemental abundances were investigated. When a magnetic field reconnects, its energy is converted to the kinetic energy of charged particles, as observed for solar energetic particles arriving on earth. This accelerates the cosmic background nuclei, and energetic nuclei induce nonthermal reactions. A constraint on the dissipation is derived from a theoretical calculation of the nonthermal reactions during Big Bang nucleosynthesis. We found that observations of the Li and D abundances can be explained if 0.01--0.1 % of the cosmic energy density was utilized for nuclear acceleration after the electron--positron annihilation epoch. Reconnections of such amplitudes of magnetic fields generate outgoing jets, the bulk velocity of which evolves to values appropriate for cosmic ray (CR) nuclear energies of 0.1--1 MeV necessary for successful CR nucleosynthesis. Therefore, acceleration of cosmic background nuclei during the dissipation of primordial magnetic fields is a possible generation mechanism of soft CRs that has been suggested as a solution to the cosmic Li problem. Among the solutions suggested without exotic physics, only the dissipating magnetic field model suggested here explains observations of both low Li and high D abundances. Our results demonstrate that signatures of strong magnetic fields in the early universe have been observed in primordial elemental abundances.
