论文标题
Fermi-Ball的暗物质来自一阶相变
Fermi-ball dark matter from a first-order phase transition
论文作者
论文摘要
我们提出了一种基于早期宇宙中一级过渡的新型暗物质（DM）场景。如果深色费米子在真空真空之间存在巨大的质量差距，那么它们几乎无法渗透到新阶段。取而代之的是，它们被困在旧阶段，并积聚形成宏观对象，称为费米 - 球。我们表明，费米球可以在广泛的模型和参数空间中解释DM的丰度，这取决于最重要的，取决于深色弗里米的不对称和相变能量量表（可能达到Planck量表）。由于Fermion的量子压力与自由能释放之间的平衡是稳定的，因此，质量和大小是宏观的。但是，这种情况通常不会产生可检测的信号（这可以解释DM搜索的零结果），除了可检测到的电层引力波（GWS）用于电子级别量表相变；尽管对这种随机GW的检测并不一定意味着费米 - 球DM场景。
We propose a novel dark matter (DM) scenario based on a first-order phase transition in the early universe. If dark fermions acquire a huge mass gap between true and false vacua, they can barely penetrate into the new phase. Instead, they get trapped in the old phase and accumulate to form macroscopic objects, dubbed Fermi-balls. We show that Fermi-balls can explain the DM abundance in a wide range of models and parameter space, depending most crucially on the dark-fermion asymmetry and the phase transition energy scale (possible up to the Planck scale). They are stable by the balance between fermion's quantum pressure against free energy release, hence turn out to be macroscopic in mass and size. However, this scenario generally produces no detectable signals (which may explain the null results of DM searches), except for detectable gravitational waves (GWs) for electroweak scale phase transitions; although the detection of such stochastic GWs does not necessarily imply a Fermi-ball DM scenario.
