论文标题
来自各向异性宇宙的Spin-2暗物质
Spin-2 dark matter from anisotropic Universe in bigravity
论文作者
论文摘要
Bigravity是一般相对论的自然扩展之一，并包含一个额外的大型Spin-2场，这可能是暗物质的良好候选者。为了讨论Spin-2暗物质的产生，我们研究了两种不含Boulware-Deser幽灵的Bigravity Type-I宇宙背景方程的固定点解决方案，即Hassan-Rosen-Rosen-Rosen Biglavity和Bigravity的最小理论。我们研究固定点的本地和全球稳定性并将其分类。基于一般分析，我们提出了一种新的方案，其中自旋2暗物质是通过各向异性固定点溶液向各向同性溶液产生的。产生的Spin-2暗物质可以解释全部或一部分暗物质，可以用激光干涉仪与重力波相同的方式直接检测到。
Bigravity is one of the natural extensions of general relativity and contains an additional massive spin-2 field which can be a good candidate for dark matter. To discuss the production of spin-2 dark matter, we study fixed point solutions of the background equations for axisymmetric Bianchi type-I Universes in two bigravity theories without Boulware-Deser ghost, i.e., Hassan-Rosen bigravity and Minimal Theory of Bigravity. We investigate the local and global stability of the fixed points and classify them. Based on the general analysis, we propose a new scenario where spin-2 dark matter is produced by the transition from an anisotropic fixed point solution to isotropic one. The produced spin-2 dark matter can account for all or a part of dark matter and can be directly detected by laser interferometers in the same way as gravitational waves.
