Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2013 May 24;110(21):211302. doi: 10.1103/PhysRevLett.110.211302. Epub 2013 May 23.
We point out that current constraints on dark matter imply only that the majority of dark matter is cold and collisionless. A subdominant fraction of dark matter could have much stronger interactions. In particular, it could interact in a manner that dissipates energy, thereby cooling into a rotationally supported disk, much as baryons do. We call this proposed new dark matter component double-disk dark matter (DDDM). We argue that DDDM could constitute a fraction of all matter roughly as large as the fraction in baryons, and that it could be detected through its gravitational effects on the motion of stars in galaxies, for example. Furthermore, if DDDM can annihilate to gamma rays, it would give rise to an indirect detection signal distributed across the sky that differs dramatically from that predicted for ordinary dark matter. DDDM and more general partially interacting dark matter scenarios provide a large unexplored space of testable new physics ideas.
我们指出，当前对暗物质的限制仅表明暗物质的大多数是冷且无碰撞的。暗物质的一个次要部分可能具有更强的相互作用。特别是，它可以以耗散能量的方式相互作用，从而冷却成旋转支撑的盘，就像重子那样。我们称这种新提出的暗物质成分是双盘暗物质（DDDM）。我们认为，DDDM 可以构成大约与重子中物质一样大的一部分，并且可以通过其对星系中恒星运动的引力影响来检测到，例如。此外，如果 DDDM 可以湮灭成伽马射线，它将产生一个分布在整个天空的间接探测信号，与普通暗物质的预测有很大的不同。DDDM 和更一般的部分相互作用的暗物质情景为可测试的新物理思想提供了一个广阔的未知领域。
