A designer approach to f(Q) gravity and cosmological implications

被引：69

作者：

Albuquerque, Ines S. ^{[1
]}

Frusciante, Noemi ^{[1
]}

机构：

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

来源：

PHYSICS OF THE DARK UNIVERSE | 2022年 / 35卷

关键词：

Cosmology; Modified gravity; Growth of structures; DARK ENERGY; MODELS;

D O I：

10.1016/j.dark.2022.100980

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the evolution of linear perturbations in the Symmetric Teleparallel Gravity, namely f(Q) gravity, for which we design the f(Q) function to match specific expansion histories. We consider different evolutions of the effective dark energy equation of state, w(Q)(a), which includes w(Q) = -1, a constant w(Q) not equal -1 and a fast varying equation of state. We identify clear patterns in the effective gravitational coupling, which accordingly modifies the linear growth of large scale structures. We provide theoretical predictions for the product of the growth rate (f ) over tilde and the root mean square of matter fluctuations sigma(8), namely (f) over tilde sigma(8) and for the sign of the cross-correlation power spectrum of the galaxy fluctuations and the cosmic microwave background radiation anisotropies. These properties can be used to distinguish the f(Q) gravity from the standard cosmological model using accurate cosmological observations. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：12

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