Reconstruction of the dark matter-vacuum energy interaction
Reconstruction of the dark matter-vacuum energy interaction
复制标题
暗物质-真空能量相互作用的重建
DOI：
10.1103/physrevd.92.103005
复制
发表时间：
2015-05
影响因子：
5
通讯作者：
Crittenden Robert G.
中科院分区：
文献类型：
--
作者：
Wang Yuting;Zhao Gong-Bo;W;s David;Pogosian Levon;Crittenden Robert G.
真空能量和暗物质之间的相互作用是一种有趣的可能性，它可能提供一种解决宇宙常数问题的方法。采用两个暗分量之间动量交换的一般公式，利用宇宙微波背景、超新星和大尺度结构的观测数据，用非参数贝叶斯方法重建了暗物质与真空能量之间耦合强度的时间演化α（a）.真空能量和暗物质之间不断发展的相互作用消除了不同数据集之间的一些紧张关系。然而，在贝叶斯意义上，它并不优于ΛCDM，因为拟合的改善不足以补偿参数空间的体积的增加。
An interaction between the vacuum energy and dark matter is an intriguing possibility which may offer a way of solving the cosmological constant problem. Adopting a general prescription for momentum exchange between the two dark components, we reconstruct α(a), the temporal evolution of the coupling strength between dark matter and vacuum energy, in a nonparametric Bayesian approach using combined observational data sets from the cosmic microwave background, supernovae and large scale structure. An evolving interaction between the vacuum energy and dark matter removes some of the tensions between different data sets. However, it is not preferred over ΛCDM in the Bayesian sense, as improvement in the fit is not sufficient to compensate for the increase in the volume of the parameter space.