论文标题
单位化的NLO手性扰动理论中的轴轴测热化速率
Axion-pion thermalization rate in unitarized NLO chiral perturbation theory
论文作者
论文摘要
我们计算单位化的NLO手性扰动理论中的轴散射$aπ\至ππ$，与早期宇宙中的轴突热化速率有关。后者扩大了轴 - 杆散射手性膨胀的有效性范围，因此，每当轴轴解耦合温度低于QCD相过渡的温度下，就可以可靠地确定热轴的遗物密度。简要讨论对宇宙学观察物的含义。
We compute the axion-pion scattering $a π\to ππ$, relevant for the axion thermalization rate in the early universe, within unitarized NLO chiral perturbation theory. The latter extends the range of validity of the chiral expansion of axion-pion scattering and thus provides a crucial ingredient for the reliable determination of the relic density of thermal axions, whenever the axion decoupling temperature is below that of the QCD phase transition. Implications for cosmological observables are briefly discussed.
