发表机构
Tel-Aviv University; Institut de Física d’Altes Energies (IFAE); The Barcelona Institute of Science and Technology; Institució Catalana de Recerca i Estudis Avançats (ICREA); New York University（特拉维夫大学; 高能物理研究所（IFAE）; 巴塞罗那科学技术研究所; 加泰罗尼亚高级研究学院（ICREA）; 纽约大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出通过暗 sector 相互作用，eV 尺度费米子暗物质可规避传统特雷梅因-冈质量约束，构建了后期相变产生所需动力学的模型，为极轻费米子暗物质提供了新路径。
AI 中文摘要
泡利不相容原理常被认为对星系中费米子暗物质的质量施加了与模型无关的下限。我们表明，暗 sector 相互作用可大幅削弱这一结论。具体而言，eV 尺度的费米子可形成具有矮星系特征尺寸和密度的束缚结构，从而规避传统的特雷梅因-冈质量约束。在这些天体中，简并压力被强于引力的有限范围标量 Yukawa 吸引力平衡。该相互作用作用于矮星系尺度，而在更大尺度上被屏蔽。我们推导了由此产生的暗物质流体的演化，并确定了一个可行的宇宙学历史，其中结构最初通过引力形成，而新相互作用仅在后期变得活跃。作为概念验证，我们构建了一个模型，其中单个后期相变产生所需的动力学。这些结果为极轻费米子暗物质提供了新的途径，并表明暗 sector 相互作用可定性改变传统的相空间极限。
英文摘要
Pauli exclusion is often regarded as imposing a model-independent lower bound on the mass of fermionic dark matter in galaxies. We show that dark-sector interactions can substantially weaken this conclusion. In particular, eV-scale fermions can form bound structures with the characteristic sizes and densities of dwarf galaxies, thereby circumventing the conventional Tremaine-Gunn mass constraint. Within these objects, the degeneracy pressure is balanced by an attractive finite-range scalar Yukawa force that is significantly stronger than gravity. The interaction acts on dwarf-galaxy scales while remaining screened on larger scales. We derive the evolution of the resulting dark-matter fluid and identify a viable cosmological history in which structures first form gravitationally, with the new interaction becoming active only at late times. As a proof of concept, we construct a model in which a single late-time phase transition generates the required dynamics. These results provide a new route to exceptionally light fermionic dark matter and demonstrate that dark-sector interactions can qualitatively alter conventional phase-space limits.
Comments8 pages, 3 figures; 9 pages of Supplemental Material with 2 figures
