Dark energy and dark matter
Dark energy and dark matter
复制标题
DOI：
10.1016/j.physletb.2003.05.006
复制
发表时间：
2003-02
影响因子：
4.4
通讯作者：
D. Comelli;M. Pietroni;A. Riotto
中科院分区：
文献类型：
--
作者：
D. Comelli;M. Pietroni;A. Riotto
这是一个谜，为什么暗物质和暗能量的密度在今天几乎相等，而它们在宇宙膨胀期间的规模却如此不同。如果两个暗扇区之间存在耦合，这个难题可能会得到解决。在这封信中，我们假设暗物质是由冷遗迹组成的，其质量按指数依赖于与暗能量相关的标量场。由于系统的动力学是由吸引子解主导的，暗物质粒子质量被迫随时间变化，以确保暗物质和暗能量的能量密度之比在晚些时候变得恒定，人们很容易意识到，当暗物质粒子从热浴中分离时，今天的暗物质丰度对其值并不是很敏感。我们发现，目前冷暗物质丰度对模型参数的依赖关系与我们熟悉的暗能量和暗物质之间没有联系的结果有很大的不同。特别是，我们分析了冷暗物质粒子是最轻的超对称粒子的情况。
It is a puzzle why the densities of dark matter and dark energy are nearly equal today when they scale so differently during the expansion of the universe. This conundrum may be solved if there is a coupling between the two dark sectors. In this Letter we assume that dark matter is made of cold relics with masses depending exponentially on the scalar field associated to dark energy. Since the dynamics of the system is dominated by an attractor solution, the dark matter particle mass is forced to change with time as to ensure that the ratio between the energy densities of dark matter and dark energy become a constant at late times and one readily realizes that the present-day dark matter abundance is not very sensitive to its value when dark matter particles decouple from the thermal bath. We show that the dependence of the present abundance of cold dark matter on the parameters of the model differs drastically from the familiar results where no connection between dark energy and dark matter is present. In particular, we analyze the case in which the cold dark matter particle is the lightest supersymmetric particle.