Interacting dark energy, holographic principle, and coincidence problem
Interacting dark energy, holographic principle, and coincidence problem
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DOI：
10.1103/physrevd.73.123510
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发表时间：
2006-01
影响因子：
5
通讯作者：
Bo Hu;Yi Ling
中科院分区：
文献类型：
--
作者：
Bo Hu;Yi Ling
相互作用和全息暗能量模型涉及两个重要的量。一个是全息束缚的特征尺寸，另一个是暗能量和暗物质之间相互作用的耦合项。而不是固定他们中的任何一个，我们提出了一个详细的研究，这些数量和宇宙学参数之间的理论关系，以及在一般形式主义的观测约束。特别是，我们认为，暗物质的暗能量密度的比例取决于这两个量的选择，从而提供了一种机制，以改变从标准宇宙学的比例的演化历史，这样的巧合问题可能会得到解决。我们详细研究了这个问题，并构建了明确的模型来证明，它可以得到缓解，提供适当指定的相互作用项和全息约束的特征尺寸。而且，这些模型至少在低红移区与当前的观测结果吻合得很好。
The interacting and holographic dark energy models involve two important quantities. One is the characteristic size of the holographic bound and the other is the coupling term of the interaction between dark energy and dark matter. Rather than fixing either of them, we present a detailed study of theoretical relationships among these quantities and cosmological parameters as well as observational constraints in a general formalism. In particular, we argue that the ratio of dark matter to dark energy density depends on the choice of these two quantities, thus providing a mechanism to change the evolution history of the ratio from that in standard cosmology such that the coincidence problem may be solved. We investigate this problem in detail and construct explicit models to demonstrate that it may be alleviated provided that the interacting term and the characteristic size of holographic bound are appropriately specified. Furthermore, these models are well fitted with the current observation at least in the low redshift region.