论文标题
瞬态非热颗粒对大爆炸核合成的影响
Effects of transient non-thermal particles on the big bang nucleosynthesis
论文作者
论文摘要
通过允许将NTD的一部分依赖于大爆炸核合成（BBN），在大爆炸核合成（BBN）中引入少量的非热分布（NTD）的影响，以便它仅在BBN进化的一定周期中贡献。该分数被建模为$ \ log（t）$的高斯形函数，其中$ t $是宇宙的温度，因此该函数由三个参数指定；中央时间位置，宽度和大小。假定由于NTD的存在而导致的平均核反应速率的变化与麦克斯韦反应率成正比，但与温度$ t _ {\ rm ntd} \ equivζt$，$ζ$是我们模型的另一个参数。通过扫描一个大约半百万点的四维参数空间，我们发现约130点，$χ^2 <1 $，在该点上预测的光元素的原始丰度与观察结果一致。这些点的幅度参数$ \ varepsilon_0 $散布在非常宽的范围内，从$ \ varepsilon_0 \ sim 10^{ - 19} $到$ \ sim 10^{ - 1} $，$ζ$ - 参数与幅度与幅度与幅度相关，与幅度与Varepss $ \ varepsil_0 $相关。 $ 0.3 \ times 10^9 \ mbox {k} \ Lessim t \ Lessim 0.4 \ times 10^9 \ mbox {k} $或临时区域$ t \ simeq 10^3 $ S的温度区域似乎在降低$χ^2 $中起着核心作用。
The effects of introducing a small amount of non-thermal distribution (NTD) of elements in big bang nucleosynthesis (BBN) are studied by allowing a fraction of the NTD to be time-dependent so that it contributes only during a certain period of the BBN evolution. The fraction is modeled as a Gaussian-shaped function of $\log(T)$, where $T$ is the temperature of the cosmos, and thus the function is specified by three parameters; the central temporal position, the width and the magnitude. The change in the average nuclear reaction rates due to the presence of the NTD is assumed to be proportional to the Maxwellian reaction rates but with temperature $T_{\rm NTD} \equiv ζT$, $ζ$ being another parameter of our model. By scanning a wide four-dimensional parametric space at about half a million points, we have found about 130 points with $χ^2< 1$, at which the predicted primordial abundances of light elements are consistent with the observations. The magnitude parameter $\varepsilon_0$ of these points turns out to be scattered over a very wide range from $\varepsilon_0 \sim 10^{-19}$ to $\sim 10^{-1}$, and the $ζ$-parameter is found to be strongly correlated with the magnitude parameter $\varepsilon_0$. The temperature region with $0.3\times 10^9 \mbox{K} \lesssim T \lesssim 0.4\times 10^9 \mbox{K}$ or the temporal region $t\simeq 10^3$ s seems to play a central role in lowering $χ^2$.
