f(Q, Lm)引力中不同形式下的暗能量模型研究
Study of the dark energy models in f(Q, Lm) gravity in different formalisms
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中文总结 AI 辅助
本研究在f(Q, Lm)引力框架下，利用多种状态方程参数和联合观测数据，构建暗能量模型，成功再现宇宙从减速到加速的平滑过渡，并验证了模型的物理可行性与稳定性。
中文摘要 AI 辅助
我们在平坦的弗里德曼-勒梅特-罗伯逊-沃尔克时空框架下，研究了f(Q, Lm)引力中宇宙的晚期宇宙学演化。利用多种状态方程（EoS）参数，如Chevallier Polarski Linder (CPL)、Jassal Bagla Padmanabhan (JBP)、Barboza Alcaniz (BA)和对数（LOG）形式，讨论了弗里德曼方程的宇宙动力学。我们联合使用哈勃（OHD）、DES五年Ia型超新星（DES 5YR）和重子声学振荡（BAO）测量的观测数据集，获得了模型参数的最佳拟合值，这些值与当前观测结果吻合良好。这些模型展示了从早期减速到晚期加速的平滑过渡。状态方程参数在广泛的红移范围内表现出类似quintessence的行为，并且随着z趋近于-1，其行为逐渐从类quintessence收敛到类phantom，但BA情况除外。此外，我们研究了模型的物理特性以评估其物理可行性。我们还分析了能量条件并检验了所提出模型的稳定性。
英文摘要
We study the late time cosmological evolution of the Universe in the framework of a flat Friedmann Lemaitre Robertson-Walker spacetime in f(Q,Lm) gravity. The cosmic dynamics of the Friedmann equations are discussed using various equation of state (EoS) parameters like Chevallier Polarski Linder (CPL), Jassal Bagla Padmanabhan (JBP), Barboza Alcaniz (BA), and Logarithmic (LOG). We use joint observational datasets of Hubble (OHD), DES five year Type Ia supernovae (DES 5YR), and the Baryon Acoustic Oscillation (BAO) measurements to obtain the best fit values of model parameters, which show good agreement with current observations. These models exhibit a smooth transition from early deceleration to late time acceleration. The equation of state parameter displays quintessence like behaviour over a wide redshift range and gradually converges its behaviour from quintessence-like to phantom-like behaviour as z tends to -1, except in the BA case. Furthermore, we investigate the physical characteristics of the model in order to assess its physical viability. We also analyse the energy conditions and examine the stability of the proposed model.
发表机构
- Bennett University（贝内特大学）
- Netaji Subhas University of Technology（内塔吉·苏巴斯理工大学）
- GLA University（GLA大学）
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