Evidence for interacting dark energy from BOSS
Evidence for interacting dark energy from BOSS
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来自 BOSS 的暗能量相互作用的证据
DOI：
10.1103/physrevd.95.043520
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发表时间：
2017-02-21
影响因子：
5
通讯作者：
Wang, Bin
中科院分区：
文献类型：
--
作者：
Ferreira, Elisa G. M.;Quintin, Jerome;Wang, Bin
BOSS-SDSS合作小组通过测量来自高红移类星体的Lyman-alpha森林的重子声学振荡，得出了与标准的$\mathrm{\ensuremath{\Lambda}}$ -冷暗物质模型$2.5\ensuremath{\sigma}$不同的结果。这是第一次测量高红移暗能量的演化，目前的结果不能用宇宙常数的简单概括来解释。我们在这里表明，一个简单的现象相互作用在黑暗部门提供了一个很好的解释这种偏差，自然适应哈勃参数得到的BOSS， $H(z=2.34)=222\ifmmode\pm\else\textpm\fi{}7\text{ }\text{ }\mathrm{km}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }{\mathrm{Mpc}}^{\ensuremath{-}1}$。通过对包含该新数据集和相互作用模型的普朗克数据的参数进行全局拟合，我们能够显示一些相互作用模型对$H(2.34)$和${D}_{\mathrm{A}}(2.34)$的约束与BOSS协作获得的约束兼容，显示出比$\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$更好的一致性。我们还证明了具有小正耦合常数的相互作用模型与宇宙学观测是相容的，这有助于缓解巧合问题。添加这些新的重子声学振荡数据的可能性显示了整体拟合的改进，尽管它在统计上并不显著。耦合常数不能完全受到所使用的数据集的约束，但暗能量状态方程显示出对不同于宇宙常数的值的轻微偏好。
The result presented by the BOSS-SDSS Collaboration measuring the baryon acoustic oscillations of the Lyman-alpha forest from high-redshift quasars indicates a $2.5\ensuremath{\sigma}$ departure from the standard $\mathrm{\ensuremath{\Lambda}}$-cold-dark-matter model. This is the first time that the evolution of dark energy at high redshifts has been measured, and the current results cannot be explained by simple generalizations of the cosmological constant. We show here that a simple phenomenological interaction in the dark sector provides a good explanation for this deviation, naturally accommodating the Hubble parameter obtained by BOSS, $H(z=2.34)=222\ifmmode\pm\else\textpm\fi{}7\text{ }\text{ }\mathrm{km}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }{\mathrm{Mpc}}^{\ensuremath{-}1}$. By performing a global fit of the parameters with the inclusion of this new data set together with the Planck data for the interacting model, we are able to show that some interacting models have constraints for $H(2.34)$ and ${D}_{\mathrm{A}}(2.34)$ that are compatible with the ones obtained by the BOSS Collaboration, showing a better concordance than $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$. We also show that the interacting models that have a small positive coupling constant, which helps alleviate the coincidence problem, are compatible with the cosmological observations. Adding the likelihood of these new baryon acoustic oscillations data shows an improvement in the global fit, although it is not statistically significant. The coupling constant could not be fully constrained by the data sets used, but the dark energy equation of state shows a slight preference for a value different from a cosmological constant.