宇宙空洞观测与原始磁场发生相一致
Cosmic-void observations reconciled with primordial magnetogenesis
摘要：
有人认为，宇宙空洞中星系际介质所承载的弱磁场可能是早期宇宙的遗迹。然而，公认的湍流磁流体动力学衰减模型预测，目前的电场强度最初产生的电弱相变（EWPT）没有宇称破坏将太低，解释观测到的散射$γ$ -射线从TeV耀变体。在这里，我们提出的衰减介导的磁重联和保存的磁螺旋度的均方波动水平。我们发现，遗迹领域将在这个理论下强几个数量级比以前的治疗，恢复EWPT遗迹假设的一致性与观测的限制。此外，有效的EWPT磁生作用将产生强度所需的遗迹，以通过重组和种子星系团场的磁效应来解决哈勃张力，接近它们现在的强度。
英文摘要：
It has been suggested that the weak magnetic field hosted by the intergalactic medium in cosmic voids could be a relic from the early Universe. However, accepted models of turbulent magnetohydrodynamic decay predict that the present-day strength of fields originally generated at the electroweak phase transition (EWPT) without parity violation would be too low to explain the observed scattering of $γ$-rays from TeV blazars. Here, we propose that the decay is mediated by magnetic reconnection and conserves the mean square fluctuation level of magnetic helicity. We find that the relic fields would be stronger by several orders of magnitude under this theory than was indicated by previous treatments, which restores the consistency of the EWPT-relic hypothesis with the observational constraints. Moreover, efficient EWPT magnetogenesis would produce relics at the strength required to resolve the Hubble tension via magnetic effects at recombination and seed galaxy-cluster fields close to their present-day strength.
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