来自费米斥力的矮星系核
Cores in Dwarf Galaxies from Fermi Repulsion
摘要：
我们表明，费米排斥可以导致核心的密度分布在矮星系的亚千电子伏的费米暗物质。我们把暗物质看作准简并的自引力费米气体，并在流体静力平衡的假设下计算了它的密度分布。我们发现，对于质量在70 eV - 400 eV范围内的费米子暗物质，可以获得大于130 pc的合适的矮星系核。虽然在传统的暗物质的情况下，这种亚keV的热暗物质将被排除在自由流动的界限，改善了约束的模型与暗物质在较低的温度比传统的热的情况下，如泛暗物质模型，我们以前考虑过。修改的参数Tremaine和Gunn，我们得到一个保守的70 eV的费米子暗物质的质量下限和一个更强的下限从莱曼- $α$云约470 eV，导致略小于已观察到的核心。我们评论这一结果，以及如何放松紧张的暗物质的情况下，非热动量分布。
英文摘要：
We show that Fermi repulsion can lead to cored density profiles in dwarf galaxies for sub-keV fermionic dark matter. We treat the dark matter as a quasi-degenerate self-gravitating Fermi gas and calculate its density profile assuming hydrostatic equilibrium. We find that suitable dwarf galaxy cores of larger than 130 pc can be achieved for fermion dark matter with mass in the range 70 eV - 400 eV. While in conventional dark matter scenarios, such sub-keV thermal dark matter would be excluded by free streaming bounds, the constraints are ameliorated in models with dark matter at lower temperature than conventional thermal scenarios, such as the Flooded Dark Matter model that we have previously considered. Modifying the arguments of Tremaine and Gunn we derive a conservative lower bound on the mass of fermionic dark matter of 70 eV and a stronger lower bound from Lyman-$α$ clouds of about 470 eV, leading to slightly smaller cores than have been observed. We comment on this result and how the tension is relaxed in dark matter scenarios with non-thermal momentum distributions.
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