论文标题
用原始磁场缓解哈勃张力
Relieving the Hubble tension with primordial magnetic fields
论文作者
论文摘要
由普朗克卫星制定的准确宇宙微波背景测量确定的标准宇宙学模型意味着哈勃常数$ H_0 $的值，$ 4.2 $的标准偏差低于从IA型超新星确定的偏差。 Planck最佳拟合模型还可以预测，与从Dark Energy Survey Year 1数据中获得的物质密度分数$ω_m$ $ω_m$和聚类幅度$ S_8 $的值更高。在这里，我们表明，由于巴里昂密度的额外小规模不均匀性而导致的重组率提高，可能会解决$ H_0 $和$ S_8-ω_M$ tensions的$ H_0 $。在重组之前，血浆中存在的原始磁场可以诱导额外的重子不均匀性。解决哈勃张力的所需野外强度正是解释银河系，群集和乳清外磁场的存在所需的，而无需依赖发电机扩增。我们的结果显示了这种作用的明确证据，并激发了对原始磁场的进一步详细研究，为未来的观察设定了几个定义明确的目标。
The standard cosmological model determined from the accurate cosmic microwave background measurements made by the Planck satellite implies a value of the Hubble constant $H_0$ that is $4.2$ standard deviations lower than the one determined from Type Ia supernovae. The Planck best fit model also predicts higher values of the matter density fraction $Ω_m$ and clustering amplitude $S_8$ compared to those obtained from the Dark Energy Survey Year 1 data. Here we show that accounting for the enhanced recombination rate due to additional small-scale inhomogeneities in the baryon density may solve both the $H_0$ and the $S_8-Ω_m$ tensions. The additional baryon inhomogeneities can be induced by primordial magnetic fields present in the plasma prior to recombination. The required field strength to solve the Hubble tension is just what is needed to explain the existence of galactic, cluster, and extragalactic magnetic fields without relying on dynamo amplification. Our results show clear evidence for this effect and motivate further detailed studies of primordial magnetic fields, setting several well-defined targets for future observations.
