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arXiv 1209.3763gr-qcastro-ph.CO
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Brans-Dicke-BSBM理论中的变化α和宇宙加速:稳定性分析和观测检验

Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests

H. Farajollahi, A. Salehi

摘要:

本文将广义BSBM模型与Brans-Dicke宇宙学模型相结合,研究了精细结构常数变化与当前宇宙加速的理论框架。我们首先发展了一种数学形式来分析模型的稳定性。利用观测数据约束模型参数,对模型进行相空间分析,检测模型的吸引子解。然后,我们检查模型对观测数据,如观测哈勃参数数据集和类星体吸收光谱。结果证实了当前的宇宙加速,也预测了精细结构常数的变化。此外,高红移最佳拟合模型($z> 15$)的外推表明,宇宙早期精细结构常数的变化明显较大。

英文摘要:

By integration of generalized BSBM and Brans-Dicke cosmological models, in this article, we investigate the theoretical framework of fine structure constant variation and current cosmic acceleration. We first develop a mathematical formalism to analyse the stability of the model. By employing observational data to constrain the model parameters, phase space is performed and the attractor solutions of the model are detected. We then examine the model against observational data such as observational Hubble parameter dataset and quasar absorption spectra. The results confirms current universe acceleration and also predicts fine structure constant variation. Furthermore, extrapolation of the best fitted model in high redshift ($z> 15$) illustrates a significantly larger variation of fine structure constant in earlier epoch of 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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