论文标题
从稀释的域壁上的更多轴
More axions from diluted domain walls
论文作者
论文摘要
我们考虑peccei-quinn对称破坏之后是通货膨胀时期的情况。一个特别有趣的情况是，由对称性破裂产生的弦域壁网在QCD相变之后进入地平线。我们表明，这种弦域壁网络产生的大量轴是违反直觉的要大得多，要比传统的通货膨胀后Peccei-quinn对称性破坏场景。结果，即使是$ 10^8 $ gev的天体物理界限，轴突衰变常数的情况也可以解释观察到的深色物质。由弦域墙网络产生的轴突迷你山地比传统方案要大得多。我们还简要讨论了可以实现这种情况的模型，例如通货膨胀期间的Peccei-Quinn相变或Peccei-Quinn相变之后的第二次通胀。
We consider the scenario in which the Peccei-Quinn symmetry breaking is followed by a period of inflation. A particularly interesting case is that the string-domain wall network produced by the symmetry breaking enters the horizon after the QCD phase transition. We show that the abundance of axions produced by such a string-domain wall network is counterintuitively much larger than the conventional post-inflationary Peccei-Quinn symmetry breaking scenario. As a result, a scenario with the axion decay constant even as low as the astrophysical bound of about $10^8$ GeV can explain the observed abundance of dark matter. The axion mini-halos produced from the string-domain wall network is much more massive than the conventional scenario. We also briefly discuss models which can realize this scenario such as a Peccei-Quinn phase transition during inflation or a second inflation after a Peccei-Quinn phase transition.
