Late-time cosmology with phantom dark-energy in f(Q) gravity

被引：56

作者：

Lymperis, Andreas ^{[1
]}

机构：

[1] Univ Patras, Dept Phys, Patras 26500, Greece

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2022年 / 11期

关键词：

dark energy theory; modified gravity;

D O I：

10.1088/1475-7516/2022/11/018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Motivated by the exciting features and a recent proposed general form of the function of non-metricity scalar Q, we investigate the cosmological implications in f(Q) gravity, through the resulting effective dark energy sector, extracting analytical expressions for the dark energy density, equation-of-state and the deceleration parameters. We show that even in the absence of a cosmological constant, the universe exhibits the usual thermal history, with the sequence of matter and dark energy eras, and the dark-energy equation-of-state parameter always lie in the phantom regime. Additionally, calculating the age of the universe, through the extracted analytical equations of the scenario at hand, we show that the result coincide with the value corresponding to ACDM scenario within 1a. Moreover, we show the excellent agreement of the scenario at hand with Supernovae type Ia observational data. Lastly, comparing the cosmological behavior in the case of the absence of an explicit cosmological constant, with the one of the presence of a cosmological constant we show that f(Q) gravity can mimic the cosmological constant in a very efficient way, providing very similar behavior, revealing the advantages and capabilitites of the scenario at hand.

引用

页数：17

共 91 条

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