II. Institute for Theoretical Physics, University of Hamburg, Luruper Chausse 149, DE-22761 Hamburg, Germany.
Phys Rev Lett. 2012 Dec 7;109(23):231301. doi: 10.1103/PhysRevLett.109.231301. Epub 2012 Dec 3.
The cold dark matter paradigm describes the large-scale structure of the Universe remarkably well. However, there exists some tension with the observed abundances and internal density structures of both field dwarf galaxies and galactic satellites. Here, we demonstrate that a simple class of dark matter models may offer a viable solution to all of these problems simultaneously. Their key phenomenological properties are velocity-dependent self-interactions mediated by a light vector messenger and thermal production with much later kinetic decoupling than in the standard case.
冷暗物质范例能很好地描述宇宙的大规模结构。然而，在观测到的场矮星系和星系卫星的丰度和内部密度结构方面，存在一些紧张关系。在这里，我们证明了一类简单的暗物质模型可能为所有这些问题提供一个可行的解决方案。它们的关键现象学特性是由轻矢量信使介导的速度相关的自相互作用，以及与标准情况相比，具有更晚的动力学解耦的热产生。
