arXiv 1602.005582016-02gr-qcastro-ph.COhep-phhep-thmath-phmath.MP

受天体物理观测约束的几何暗能量可穿越虫洞

Geometric dark energy traversable wormholes constrained by astrophysical observations

Deng Wang, Xin-He Meng

备注：: 17ps, 7figs

摘要：

本文将天体物理观测引入到虫洞研究中，并不意味着对暗能量模型的一般性参数约束，而是通过对宇宙状态方程参数演化行为的考察，进一步了解虫洞可能存在于宇宙演化的哪个阶段。作为一个具体的例子，我们研究了天体物理数据约束下的Ricci暗能量（RDE）可穿越虫洞。特别地，从本工作的图\ref{fig5}中可以发现，当有效状态方程参数$ω_X<-1$，即能量条件（NEC）被明显违反时，虫洞就会出现（打开）。在此基础上，得到了RDE支持的静态球对称可穿越虫洞的六个具体解。除了常数红移函数的情况下，该解不仅是渐近平坦的，而且是可穿越的，其余5个解都不是渐近平坦的，因此，来自RDE流体的奇异物质在空间上分布在喉道附近.此外，我们还分析了RDE可穿越虫洞的物理特性和性质。值得注意的是，通过天体物理观测，我们得到了RDE模型参数的约束条件，探索了宇宙变化不同阶段的奇异RDE流体类型，限制了虫洞研究可用模型的数量，减少了RDE模型中不同参数对应的虫洞数目，从观测的新角度为虫洞研究提供了更清晰的图像宇宙学背景

英文摘要：

In this letter, we introduce the astrophysical observations into the wormhole research, which is not meant to general parameters constraints for the dark energy models, in order to understand more about in which stage of the universe evolutions wormholes may exist through the investigation of the evolution behavior of the cosmic equation of state parameter. As a concrete instance, we investigate the Ricci dark energy (RDE) traversable wormholes constrained by astrophysical data-sets. Particularly, we can discover from Fig. \ref{fig5} of the present work, when the effective equation of state parameter $ω_X<-1$, namely, the Null Energy conditions (NEC) is violated clearly, the wormholes will appear (open). Subsequently, six specific solutions of static and spherically symmetric traversable wormhole supported by the RDE are obtained. Except for the case of constant redshift function, in which the solution is not only asymptotically flat but also traversable, the remaining five solutions are all not asymptotically flat, therefore, the exotic matter from the RDE fluids is spatially distributed in the vicinity of the throat. Furthermore, we analyze the physical characteristics and properties of the RDE traversable wormholes. It is worth noting that, through the astrophysical observations, we get constraints on the parameters of RDE model, explore the type of exotic RDE fluids in different stages of the universe changing, limit the number of available models for wormhole research, reduce the number of the wormholes corresponding to different parameters for RDE model and provide a more apparent picture for wormhole investigations from the new perspective of observational cosmology background

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