极轻玻色暗物质结构形成的高分辨率模拟
High-Resolution Simulation on Structure Formation with Extremely Light Bosonic Dark Matter
摘要：
另一种玻色子暗物质模型通过高分辨率模拟详细检查。这些玻色子具有$10^{-22}eV$级的粒子质量，并且不相互作用。如果它们确实存在，并且能够解释结构的形成，那么这些玻色子必须被凝聚成玻色-爱因斯坦态，并由相干的波函数来描述。这种物质，也被称为模糊暗物质（Hu，Barkana & Gruzinov 2000），被推测能够，首先，消除亚星系晕，以解决矮星系过多的问题，其次，在星系中产生扁平的晕核，这是一些观察所提出的。我们的模拟结果表明，虽然这种极轻的玻色子暗物质确实抑制了低质量晕，但与预期相反，它可以产生奇异的晕核。奇异晕的密度分布与Navarro，Frenk & White（1997）的晕分布几乎相同。这样一个轮廓似乎是普遍的，因为它可以通过吸积或合并产生。
英文摘要：
An alternative bosonic dark matter model is examined in detail via high-resolution simulations. These bosons have particle mass of order $10^{-22}eV$ and are non-interacting. If they do exist and can account for structure formation, these bosons must be condensed into the Bose-Einstein state and described by a coherent wave function. This matter, also known as Fuzzy Dark Matter (Hu, Barkana & Gruzinov 2000),, is speculated to be able, first, to eliminate the sub-galactic halos to solve the problem of over-abundance of dwarf galaxies, and, second, to produce flat halo cores in galaxies suggested by some observations. Our simulation results show that although this extremely light bosonic dark matter indeed suppresses low-mass halos, it can, to the contrary of expectation, yield singular halo cores. The density profile of the singular halo is almost identical to the halo profile of Navarro, Frenk & White (1997). Such a profile seems to be universal, in that it can be produced via either accretion or merger.
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