Signatures of f(Q) gravity in cosmology

被引：212

作者：

Frusciante, Noemi ^{[1
]}

机构：

[1] Univ Lisbon, Fac Ciencias, Inst Astrofis & Ciencias Espaco, Edificio C8, P-1749016 Lisbon, Portugal

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 04期

关键词：

BARYON ACOUSTIC-OSCILLATIONS; DARK-ENERGY; HUBBLE CONSTANT; CONSTRAINTS; GALAXIES; LAMBDA;

D O I：

10.1103/PhysRevD.103.044021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the impact on cosmological observables of f (Q)-gravity, a specific class of modified gravity models in which gravity is described by the nonmetricity scalar, Q. In particular we focus on a specific model which is indistinguishable from the Lambda-cold-dark-matter (Lambda CDM) model at the background level, while showing peculiar and measurable signatures at linear perturbation level. These are attributed to a time-dependent Planck mass and are regulated by a single dimensionless parameter, alpha. In comparison to the Lambda CDM model, we find for positive values of alpha a suppressed matter power spectrum and lensing effect on the cosmic microwave background radiation (CMB) angular power spectrum and an enhanced integrated-Sachs-Wolfe tail of CMB temperature anisotropies. The opposite behaviors are present when the alpha parameter is negative. We also investigate the modified gravitational waves (GWs) propagation and show the prediction of the GWs luminosity distance compared to the standard electromagnetic one. Finally, we infer the accuracy on the free parameter of the model with standard sirens at future GWs detectors.

引用

页数：8

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