arXiv 1503.025952015-03-09astro-ph.COgr-qchep-th

具有空间曲率的CCDM模型与“暗简并”的破缺

CCDM Model with Spatial Curvature and The Breaking of "Dark Degeneracy"

J. F. Jesus, F. Andrade-Oliveira

备注：: 13 pages, 5 figures
DOI：: 10.1088/1475-7516/2016/01/014

摘要：

在爱因斯坦场方程的背景下，冷暗物质（CCDM）的产生导致了负的创造压力，这可以用来解释宇宙的加速膨胀。最近的研究表明，这种模型的膨胀动力学不能与协调$Λ$ CDM模型区分开来，甚至在更高阶的密度扰动演化中也是如此，导致了所谓的“暗简并”。然而，取决于CDM创建速率的形式，当与$Λ$ CDM相比时，包括空间曲率导致CCDM的不同行为，即使在背景水平。用一个简单的形式的创造率，即，$Γ\propto\frac{1}{H}$，我们表明，这个模型可以区分从$Λ$ CDM，提供宇宙有一定的空间曲率。然而，从观测上看，目前CMB对空间平坦度的限制表明，两种模型都没有明显的优势，至少在背景水平上是如此。

英文摘要：

Creation of Cold Dark Matter (CCDM), in the context of Einstein Field Equations, leads to a negative creation pressure, which can be used to explain the accelerated expansion of the Universe. Recently, it has been shown that the dynamics of expansion of such models can not be distinguished from the concordance $Λ$CDM model, even at higher orders in the evolution of density perturbations, leading at the so called "dark degeneracy". However, depending on the form of the CDM creation rate, the inclusion of spatial curvature leads to a different behavior of CCDM when compared to $Λ$CDM, even at background level. With a simple form for the creation rate, namely, $Γ\propto\frac{1}{H}$, we show that this model can be distinguished from $Λ$CDM, provided the Universe has some amount of spatial curvature. Observationally, however, the current limits on spatial flatness from CMB indicate that neither of the models are significantly favored against the other by current data, at least in the background level.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文