来自全局单极子宇宙演化的南布-戈德斯通玻色子发射
Nambu-Goldstone emissions from the cosmological evolution of global monopoles
AI总结：
研究全局单极子宇宙演化中NG玻色子发射，通过数值晶格模拟其谱特性，还在特定条件下估计了pNG暗物质丰度。
AI中文摘要：
我们展示了全局单极子宇宙演化过程中南布-戈德斯通（NG）玻色子的发射。NG玻色子通过全局单极子动力学非热产生，比如单极子与反单极子的对湮灭。我们的数值晶格模拟表明，全局单极子标度演化发射的NG玻色子谱在视界尺度附近有一个峰值，这与全局弦和半局部弦的情况一样。我们还估计了当一个（或两个）NG模式具有软质量时伪南布-戈德斯通（pNG）暗物质的丰度。
英文摘要：
We show the emission of the Nambu-Goldstone (NG) bosons from the cosmological evolution of global monopoles. The NG bosons are non-thermally produced from the dynamics of global monopoles such as the pair annihilation of monopole and anti-monopole. Our numerical lattice simulations demonstrate that the spectrum of NG bosons emitted from the scaling evolution of global monopoles has a peak around the horizon scale, as in the case with the global string and the semilocal string. We also estimate the abundance of the pseudo-Nambu-Goldstone (pNG) dark matter when one (or both) of the NG modes has a soft mass.
