Unraveling the effective fluid approach for f(R) models in the subhorizon approximation

被引：75

作者：

Arjona, Ruben ^{[1
]}

Cardona, Wilmar ^{[1
]}

Nesseris, Savvas ^{[1
]}

机构：

[1] Univ Autonoma Madrid, Inst Fis Teor, CSIC, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW D | 2019年 / 99卷 / 04期

关键词：

BARYON ACOUSTIC-OSCILLATIONS; MAIN GALAXY SAMPLE; DARK ENERGY; COSMOLOGICAL CONSTANT; MODIFIED GRAVITY; SCALAR-TENSOR; CENT DISTANCE; GROWTH; CONSTRAINTS; SKY;

D O I：

10.1103/PhysRevD.99.043516

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We provide explicit formulas for the effective fluid approach of f(R) theories, such as the HuandSawicki and designer models. Using the latter and simple modifications to the CLASS code, which we call EFCLASS, in conjunction with very accurate analytic approximations for the background evolution, we obtain competitive results in a much simpler and less error-prone approach. We also derive the initial conditions in matter domination, and we find they differ from those already found in the literature for a constant w model. A clear example is the designer model that behaves as Lambda CDM in the background but has nonetheless dark energy perturbations. We then use the aforementioned models to derive constraints from the latest cosmological data, including supernovae, BAO, CMB, H(z) and growth-rate data, and find they are statistically consistent to the Lambda CDM model. Finally, we show that the viscosity parameter c(vis)(2) in realistic models is not constant as commonly assumed but rather evolves significantly over several orders of magnitude, something which could affect forecasts of upcoming surveys.

引用

页数：23

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