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DOI码：10.1103/PhysRevD.102.075028
发表刊物：Physical Review D
摘要：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 for electroweak scale phase transitions; although the detection of such stochastic gravitational waves does not necessarily imply a Fermi-ball DM scenario.
论文类型：期刊论文
一级学科：物理学
文献类型：期刊
卷号：102
期号：075028
是否译文：否
发表时间：2020-10-23
收录刊物：SCI
发布期刊链接：https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.075028