Title: Fermi-ball in a multicomponent dark matter framework and its gravitational wave signatures Show Chinese title

Title: 多组分暗物质框架中的费米球及其引力波特征

Abstract: It has been known that under-abundant dark matter density of an inert doublet can be replenished by an additional dark matter component, say, a fermion. We find that such a scenario can lead to the formation of stable Fermi-balls through coexisting minima of the finite temperature scalar potential. More importantly, we demonstrate that the Fermi-balls contribute sizeably to the dark matter relic density. In addition, the aforesaid coexisting minima open up the possibility of a first-order phase transition. This, in turn, triggers emission of gravitational waves that can be tested at the proposed BBO and U-DECIGO detectors. Therefore, the present study becomes a concrete setup to embed Fermi-balls in a realistic two-component dark matter model, and, to test the same using gravitational wave signatures. Show Chinese abstract

Abstract: 已知惰性双组分暗物质密度不足可以通过额外的暗物质组分（例如，一个费米子）来补充。我们发现，这种情景可能导致通过有限温度标量势的共存极小值形成稳定的费米球。更重要的是，我们证明了费米球对暗物质遗迹密度有显著贡献。此外，上述共存极小值开启了一阶相变的可能性。反过来，这会触发引力波的发射，可以在提议的BBO和U-DECIGO探测器上进行测试。因此，本研究成为在一个现实的双组分暗物质模型中嵌入费米球的一个具体设定，并利用引力波信号对其进行测试。