论文标题
边缘在存在磁场的情况下信号
EDGES signal in presence of magnetic fields
论文作者
论文摘要
我们在存在红移$ z = 10-30 $的原始螺旋磁场的情况下研究21厘米的差异亮度温度。我们认为，早期设定的$α$效应可能有助于将气体温度降低到$ z = 17 $的3.2度。由于某些平等侵犯了高能量过程，因此在早期的宇宙中可能会产生这种影响。使用边缘（实验检测全局电离签名时期的结果）结果，我们发现原始磁场上的上和下限为$ 6 \ times 10^{ - 3}〜{\ rm ng} $＆$ 5 \ $ 5 \ times 10^{ - 4}〜{ - 4}〜{\ rm ng} $。我们还讨论了$α$背景对边界的影响。我们的结果在暗物质方面不需要任何新物理。
We study the 21-cm differential brightness temperature in the presence of primordial helical magnetic fields for redshift $z=10-30$. We argue that the $α$-effect that sets in at earlier time can be helpful in lowering the gas temperature to 3.2 degrees Kelvin at $z=17$. This effect can arise in the early Universe due to some parity violating high energy processes. Using the EDGES (Experiment to Detect the Global Epoch of Reionization Signature) results, we find the upper and lower limits on the primordial magnetic field to be $6\times 10^{-3}~{\rm nG} $ & $5\times 10^{-4}~{\rm nG}$ respectively. We also discuss the effect of Ly$α$ background on the bounds. Our results do not require any new physics in terms of dark matter.
