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arXiv 2501.08362gr-qc
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暗能量与宇宙演化:f(R, T)引力研究

Dark Energy and Cosmic Evolution: A Study in f (R, T) Gravity

N. Myrzakulov, S. H. Shekh, Anirudh Pradhan, Archana Dixit

AI总结:

本研究在f(R, T)引力框架下,利用多天文观测数据集和MCMC方法约束模型参数,分析暗能量相关特性,深化对宇宙演化与暗能量作用的认知。

摘要:

在平坦Friedmann Lemaitre Robertson Walker(FLRW,弗里德曼-勒梅特-罗伯逊-沃尔克)模型的f(R, T)引力理论框架下,本文采用一种特定形式的演生哈勃参数,研究宇宙的加速膨胀现象。研究使用H(z)、Ia型超新星(SNIa)和重子声学振荡(BAO)的数据集对模型进行约束,确定最优参数值,以评估f(R, T)引力的统计显著性。通过MCMC(马尔可夫链蒙特卡洛)分析求解修正的弗里德曼方程,得到最佳拟合参数,并利用这些参数计算物态方程、状态查找器、能量条件以及(w-w)平面,此外还分析了运动学宇宙学参数的演化过程。研究结果揭示了暗能量模型的重要行为与特征,深化了我们对宇宙动力学和演化的认知,同时推动了对暗能量及其塑造宇宙作用的理解。

英文摘要:

In the context of f(R, T) gravity theory for the flat Friedmann Lemaitre Robertson Walker (FLRW) model, the accelerating expansion of the universe is investigated using a specific form of the emergent Hubble parameter. Datasets from H(z), Type Ia supernovae (SNIa), and Baryon Acoustic Oscillations (BAO) are used to constrain the model and identify the ideal parameter values in order to evaluate the statistical significance of f(R, T) gravity. The best-fit parameters are derived by solving the modified Friedmann equations through a MCMC analysis. These parameters are used to compute the equation of state, statefinders, energy conditions, and the (w-w) plane. Furthermore, the evolution of kinematic cosmographic parameters is examined. The findings provide significant behavior and features of dark energy models. Our comprehension of the dynamics and evolution of the universe is improved by this study, which also advances our understanding of dark energy and how it shapes the universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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