Constraints on massive vector dark energy models from integrated Sachs-Wolfe-galaxy cross-correlations
Constraints on massive vector dark energy models from integrated Sachs-Wolfe-galaxy cross-correlations
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DOI：
10.1103/physrevd.99.063533
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发表时间：
2018-11
影响因子：
5
通讯作者：
S. Nakamura;A. D. Felice;R. Kase;S. Tsujikawa
中科院分区：
文献类型：
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作者：
S. Nakamura;A. D. Felice;R. Kase;S. Tsujikawa
引力波事件GW 170817和电磁波事件表明，在红移为zl0.009的情况下，宇宙学背景中张量扰动${c}_{T}$的速度非常接近于光的速度。在广义Proca理论中，满足条件c T =c的拉格朗日量除了对应于内禀向量模的外，还被限制为三阶导数相互作用。我们将观测约束的暗能量模型在三阶广义Proca理论与内在矢量模式运行的马尔可夫链蒙特卡罗（MCMC）代码。除了宇宙微波背景、重子声振荡、Ia型超新星、哈勃膨胀率的局部测量和红移空间畸变的数据集之外，我们还使用了集成的萨克斯-沃尔夫（ISW）信号和星系分布的互相关数据。我们表明，与三阶标量张量理论不同，内禀矢量模式的存在允许避免与当前观测数据不相容的ISW-星系的关系的可能性。因此，我们发现，暗能量模型在七阶广义Proca理论表现出更好的拟合的数据比宇宙学常数，即使包括ISW星系的相关数据中的MCMC分析。
The gravitational-wave event GW170817, together with the electromagnetic counterpart, shows that the speed of tensor perturbations ${c}_{T}$ on the cosmological background is very close to that of light $c$ for the redshift $zl0.009$. In generalized Proca theories, the Lagrangians compatible with the condition ${c}_{T}=c$ are constrained to be derivative interactions up to cubic order, besides those corresponding to intrinsic vector modes. We place observational constraints on a dark energy model in cubic-order generalized Proca theories with intrinsic vector modes by running the Markov chain Monte Carlo (MCMC) code. We use the cross-correlation data of the integrated Sachs-Wolfe (ISW) signal and galaxy distributions in addition to the data sets of cosmic microwave background, baryon acoustic oscillations, type Ia supernovae, local measurements of the Hubble expansion rate, and redshift-space distortions. We show that, unlike cubic-order scalar-tensor theories, the existence of intrinsic vector modes allows the possibility for evading the ISW-galaxy anticorrelation incompatible with the current observational data. As a result, we find that the dark energy model in cubic-order generalized Proca theories exhibits a better fit to the data than the cosmological constant, even by including the ISW-galaxy correlation data in the MCMC analysis.