Universe in f(R,G) gravity with special form of q

被引：0

作者：

Tiwari, R. K. ^{[1
]}

Shukla, Bhupendra Kumar ^{[2
]}

Beesham, A. ^{[3
,4
,5
]}

Agrawal, Sudha ^{[6
]}

机构：

[1] Govt Model Sci Coll, Dept Math, Rewa 486001, India

[2] Govt Coll, Dept Math, Sagar 470442, India

[3] Univ Zululand, Dept Math Sci, P Bag X1001, ZA-3886 Kwa Dlangezwa, South Africa

[4] Mangosuthu Technol, Fac Nat Sci, POB 12363, ZA-4026 Jacobs, South Africa

[5] Natl Inst Theoret & Computat Sci NITheCS, Stellenbosch, South Africa

[6] AKS Univ, Dept Math, Satna, MP, India

来源：

INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS | 2024年 / 21卷 / 03期

关键词：

f(R; G)gravity; special deceleration parameter; dark energy; acceleration of universe; PROBE WMAP OBSERVATIONS; F R GRAVITY; COSMOLOGICAL CONSTANT; PALATINI APPROACH; F(R) THEORIES; INFLATION; LAMBDA; MODELS; CONSISTENT; PARAMETERS;

D O I：

10.1142/S0219887824500695

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

This paper explores the dynamic behavior of the universe within the framework of the f(R,G) theory of gravity. Here, R and G represent the Ricci scalar and Gauss-Bonnet invariant, respectively. By solving the modified field equations with the chosen f(R,G)function, specifically f(R,G)=R+mR(2)+nG(2), we determine the best fit values of model parameters that are consistent with recent observational datasets. These datasets include 57 data points from the Cosmic Chronometers, Pantheon, and BAO datasets. Furthermore, we analyze the physical properties of cosmographic parameters, such as energy density and pressure, corresponding to the constrained values of the model parameters. The evolution of the deceleration parameter in our study indicates a transition from a decelerated phase to an accelerated phase in the universe. Remarkably, our f(R,G) cosmological model effectively describes the late-time cosmic acceleration without requiring the introduction of a dark energy component in the field equation

引用

页数：26

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