Modified f(Q,C) gravity dark energy models with observational constraints

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Dinesh Chandra Maurya
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引用次数: 0

Abstract

We investigate an isotropic and homogeneous flat dark energy model in f(Q,C) gravity theory that is linear in non-metricity Q and quadratic in boundary term C as f(Q,C)=Q+αC2, where α is a model parameter. We have solved the field equations in flat Friedmann–Lemaitre–Robertson–Walker (FLRW) spacetime geometry and considered a relation in the form of Hubble function in total energy density parameters Ωm0, Ω0(Q,C), and Hubble constant H0. We have compared our results with two observational datasets H(z) and Pantheon SNe Ia datasets by using MCMC analysis and have obtained the best fit present values of parameters. We have used these best fit values throughout in result analysis and discussion. We have found the equation of state (EoS) parameter as 1ω0.2 over 1z3. We have also investigated the Om diagnostic function and present age of the universe for these two datasets.

具有观测约束的修正 f(Q,C) 引力暗能量模型
我们研究了f(Q,C)引力理论中的各向同性均匀平面暗能量模型,该模型与非度量Q是线性关系,与边界项C是二次关系,即f(Q,C)=Q+αC2,其中α是模型参数。我们在平坦的弗里德曼-勒梅特尔-罗伯逊-沃克(FLRW)时空几何中求解了场方程,并考虑了总能量密度参数Ωm0、Ω0(Q,C) 和哈勃常数 H0 的哈勃函数关系。我们利用 MCMC 分析方法将我们的结果与两个观测数据集 H(z) 和 Pantheon SNe Ia 数据集进行了比较,并得到了参数的最佳拟合现值。我们在结果分析和讨论中一直使用这些最佳拟合值。我们发现在-1≤z≤3的范围内,状态方程(EoS)参数为-1≤ω≤0.2。我们还研究了这两个数据集的奥姆诊断函数和宇宙的现年龄。
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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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