论文标题
早期宇宙中的斧头
Axions in the Early Universe
论文作者
论文摘要
对强大CP问题的Peccei-Quinn解决方案提供了一个富含宇宙后果的动机框架。如果早期有热浴，则不可避免地会产生热轴。浴颗粒的散射和衰减过程可以在原始血浆中倾倒相对论轴，并且如果产生具有显着丰富的宇宙的宇宙和晚期宇宙，它们可以在宇宙学可观察到的可观察的特征中留下可观察的特征。我们为计算不同场景的轴突生产率的计算提供了最新和显着的改进，并将这些结果应用于预测产生轴的丰度。最后，我们在QCD轴质量上提供更新的宇宙学界限。
The Peccei-Quinn solution to the strong CP problem provides a motivated framework rich in cosmological consequence. Thermal axion production is unavoidable if there is a thermal bath at early times. Scattering and decay processes of bath particles can dump relativistic axions in the primordial plasma, and they can leave observable signatures in cosmological observables probing both the early and the late universe if produced with a significant abundance. We present recent and significant improvements for the calculation of the axion production rate for different scenarios and apply these results to predict the abundance of produced axions. Finally, we provide updated cosmological bounds on the QCD axion mass.
