Cosmological constraints on bulk viscous f(Q,T) gravity

被引：15

作者：

Sokoliuk, Oleksii ^{[1
,2
]}

Baransky, Alexander ^{[2
]}

机构：

[1] Natl Acad Sci Ukraine MAO NASU, Astron Observ, UA-03143 Kiev, Ukraine

[2] Taras Shevchenko Natl Univ Kyiv, Astron Observ, Kiev, Ukraine

来源：

ASTRONOMISCHE NACHRICHTEN | 2022年 / 343卷 / 05期

关键词：

bulk viscosity; cosmology; modified gravity; non-metricity; GALAXY REDSHIFT SURVEY; LAMBDA; H(Z); INFLATION; CONSTANT; HISTORY; MODEL;

D O I：

10.1002/asna.20220003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In the General Theory of Relativity (GR) gravitational interactions are described by the scalar Ricci curvature. But there exists another class of modified gravity theories equivalent to GR, described by the torsion tensor or non-metricity scalar. One of such theories, investigated in this paper is f(Q,T) gravity, built from the arbitrary function of non-metricity scalar non-minimally coupled to the trace of stress-energy tensor. Current work is aimed on the linear f(Q,T)=alpha Q+beta T gravity, where alpha and beta are free MOG parameters to be varied. As well, we assume that the fluid is bulk-viscous with pressure p?=p-3 zeta H and the bulk viscosity parameter zeta=zeta 0+zeta 1H+zeta 2(H/H+H). From the modified Einstein Field Equations (EFE's) we obtain the Hubble parameter analytically and constrain free parameters of the model through the MCMC sampling of 57 recent Hubble parameter observations. We found that computed Hubble rate for our model from MCMC sampling converges with the observational data at the +/- 1 sigma confidence level. To examine the current accelerated expansion rate of the universe in details we use the statefinder diagnostics. Besides, to distinguish ?CDM and our model we use Om(z) analysis.

引用

页数：10

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