论文标题
QCD轴心气泡的原始黑洞
Primordial Black Holes from QCD Axion Bubbles
论文作者
论文摘要
我们提出了一种场景，在早期宇宙中，强烈的Peccei-Quinn（PQ）对称性破裂会导致最初的QCD轴磁场值的较大不均匀性，从而形成非常密集的轴心气泡。一些轴心气泡随后倒入原始黑洞（PBH）。 QCD轴上的空间均匀部分解释了宇宙的暗物质，而由轴突气泡产生的PBH可以解释Ligo事件或超大质量黑洞的种子。有趣的是，PBH的质量取决于轴衰变常数。对于$ f_a = 10^{17}（10^{16}）$ gev，pbh质量比$ 10（10^4）m_ \ odot $重。此外，轴突微量簇还比PBH更丰富地从轴心气泡中形成，并且预计基于通货膨胀后PQ对称性的自发断裂，它们的质量比通常的情况重。
We propose a scenario in which a strong Peccei-Quinn (PQ) symmetry breaking in the early universe results in large inhomogeneities of the initial QCD axion field value, leading to the formation of very dense axion bubbles. Some of the axion bubbles subsequently collapse into primordial black holes (PBHs). The spatially homogeneous part of the QCD axion explains dark matter of the universe, while the PBHs arising from the axion bubbles can explain the LIGO events or the seed of supermassive black holes. Interestingly, the mass of PBH is determined by the axion decay constant; for $f_a = 10^{17} (10^{16})$ GeV, the PBH mass is heavier than about $10 (10^4) M_\odot$. In addition, axion miniclusters are also formed from the axion bubbles more abundantly than PBHs, and their masses are expected to be heavier than in the usual scenario based on the spontaneous breaking of the PQ symmetry after inflation.
