Observational constraints on Galileon cosmology
Observational constraints on Galileon cosmology
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DOI：
10.1103/physrevd.82.124054
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发表时间：
2010-10
影响因子：
5
通讯作者：
S. Nesseris;A. D. Felice;S. Tsujikawa
中科院分区：
文献类型：
--
作者：
S. Nesseris;A. D. Felice;S. Tsujikawa
我们研究了具有五个协变拉格朗日量的协变伽利略场φ的宇宙学，并将这一理论与最新的宇宙学探测：Ia型超新星数据（宪法和联盟2集），宇宙微波背景（WMAP 7）和重子声振荡（SDSS 7）进行了比较。在具有晚期德西特吸引子的伽利略宇宙学中，有一个跟踪器将具有不同初始条件的解吸引到一个共同的轨道上。包括宇宙曲率K，我们将观测约束放在两个不同的情况下：（i）跟踪器，和（ii）运动方程的一般解。我们发现，跟踪器的解决方案可以与个人的观测数据一致，但它是不利的组合数据分析。当考虑非零曲率参数Ω（0）K时，一般解表现得相当好，但Akaike和Bayesian信息准则表明，它们并不特别优于ACDM模型。
We study the cosmology of a covariant Galileon field φ with five covariant Lagrangians and confront this theory with the most recent cosmological probes: the type Ia supernovae data (Constitution and Union2 sets), cosmic microwave background (WMAP7), and the baryon acoustic oscillations (SDSS7). In the Galileon cosmology with a late-time de Sitter attractor, there is a tracker that attracts solutions with different initial conditions to a common trajectory. Including the cosmic curvature K, we place observational constraints on two distinct cases: (i) the tracker, and (ii) the generic solutions to the equations of motion. We find that the tracker solution can be consistent with the individual observational data, but it is disfavored by the combined data analysis. The generic solutions fare quite well when a nonzero curvature parameter Ω (0) K is taken into account, but the Akaike and Bayesian information criteria show that they are not particularly favored over the ACDM model.