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arXiv 1601.03387astro-ph.CO
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诱导引力暗能量模型的宇宙学约束

Cosmological constraints on induced gravity dark energy models

Mario Ballardini, Fabio Finelli, Caterina Umiltà, Daniela Paoletti

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16 pages, 10 figures
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摘要：

本文研究了一个简单单式势$\propto σ^n$和一个正指数$n$耦合的诱导引力暗能量模型。这些简单的潜力导致可行的暗能量模型与弱依赖的指数，其特点是加速膨胀的宇宙学模型中的渐近吸引子，当普通物质变得可以忽略不计。我们使用最近的宇宙学数据来约束耦合$γ$的里奇曲率，假设标量场开始在休息深的辐射时代和爱因斯坦方程中的引力常数是兼容的卡文迪许实验中测量的。通过仅使用$Planck$ 2015数据，我们获得了$n=4$的95% CL绑定$γ< 0.0017$，通过添加重子声振荡（BAO）数据，进一步收紧到$γ< 0.00075$。后一个界限比使用$Planck$ 2013数据和相同BAO数据汇编获得的限度提高了$\sim 30$ %。我们讨论了$γ$和$\dot G_N/G_N (z=0)$对$n$的依赖性。

英文摘要：

We study induced gravity dark energy models coupled with a simple monomial potential $\propto σ^n$ and a positive exponent $n$. These simple potentials lead to viable dark energy models with a weak dependence on the exponent, which characterizes the accelerated expansion of the cosmological model in the asymptotic attractor, when ordinary matter becomes negligible. We use recent cosmological data to constrain the coupling $γ$ to the Ricci curvature, under the assumptions that the scalar field starts at rest deep in the radiation era and that the gravitational constant in the Einstein equations is compatible with the one measured in a Cavendish-like experiment. By using $Planck$ 2015 data only, we obtain the 95 % CL bound $γ< 0.0017$ for $n=4$, which is further tightened to $γ< 0.00075$ by adding Baryonic Acoustic Oscillations (BAO) data. This latter bound improves by $\sim 30$ % the limit obtained with the $Planck$ 2013 data and the same compilation of BAO data. We discuss the dependence of the $γ$ and $\dot G_N/G_N (z=0)$ on $n$.

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