Modified gravity away from a ΛCDM background

Modified gravity away from a ΛCDM background
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远离 ΛCDM 背景的修正重力

DOI:
10.1088/1475-7516/2019/11/018
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发表时间:
2019
影响因子:
6.4
通讯作者:
H. Velten
H. Velten
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
G. Brando;F. Falciano;E. Linder;H. Velten

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在宇宙加速的有效场论方法中,背景膨​​胀可以与引力修改分开指定。我们探讨了在不同于宇宙学常数加冷暗物质(ΛCDM)的背景下修正引力对稳定性和宇宙学可观测量的影响,包括引力和膨胀参数之间的协方差。在无滑移重力中,更一般的背景允许更多的重力自由,包括正和负普朗克质量运行。我们研究了对宇宙结构增长的影响,并表明这种修正的引力理论很容易产生可行的正积分萨克斯-沃尔夫效应互相关。使用当前数据,我们通过蒙特卡洛分析来约束参数,找到所有宇宙时间所采用形式的运行 |αM,max|≲ 0.03 (95% CL) 的界限。我们在 GitHub 上公开提供修改后的 hi_class 代码,现在可以计算和包含可观测的红移空间畸变 fσ8 以及无滑移重力修改。
Within the effective field theory approach to cosmic acceleration, the background expansion can be specified separately from the gravitational modifications. We explore the impact of modified gravity in a background different from a cosmological constant plus cold dark matter (ΛCDM) on the stability and cosmological observables, including covariance between gravity and expansion parameters. In No Slip Gravity the more general background allows more gravitational freedom, including both positive and negative Planck mass running. We examine the effects on cosmic structure growth, as well as showing that a viable positive integrated Sachs-Wolfe effect crosscorrelation easily arises from this modified gravity theory. Using current data we constrain parameters with a Monte Carlo analysis, finding a bound on the running |αM,max|≲ 0.03 (95% CL) for the adopted form at all cosmic times. We provide the modified hi_class code publicly on GitHub, now enabling computation and inclusion of the redshift space distortion observable fσ8 as well as the No Slip Gravity modifications.
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影响因子: 4.8
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