论文标题
高Z能量释放的原始核合成约束
Primordial nucleosynthesis constraints on high-z energy releases
论文作者
论文摘要
宇宙微波背景（CMB）频谱对宇宙的热历史的严格约束至$ z \ sim 2 \ times 10^6 $。在较高的红移下，热化过程变得非常有效，因此即使大型能量发行也不会在CMB频谱中留下可见的烙印。在本文中，我们表明，原始核合成处的特定熵的准确确定与电子 - photon解耦处的一致性意味着，在当今的CMB能量密度的7.8％可以在核合成后的时代释放。正如先前研究所指出的那样，原始核合成补充了CMB频谱提供的独立约束，从而将它们扩展到红移中的两个数量级。
The cosmic microwave background (CMB) spectrum provides tight constraints on the thermal history of the universe up to $z \sim 2\times 10^6$. At higher redshifts thermalization processes become very efficient so that even large energy releases do not leave visible imprints in the CMB spectrum. In this paper we show that the consistency between the accurate determinations of the specific entropy at primordial nucleosynthesis and at the electron-photon decoupling implies that no more than 7.8% of the present day CMB energy density could have been released in the post-nucleosynthesis era. As pointed out by previous studies, primordial nucleosynthesis complements model independent constraints provided by the CMB spectrum, extending them by two orders of magnitude in redshift.
