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arXiv 2201.06866astro-ph.CO
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新的广义Chaubergin气体模型的宇宙学约束

Cosmological constrains on new generalized Chaplygin gas model

Fataneh Salahedin, Reza Pazhouhesh, Mohammad Malekjani

摘要:

我们使用不同的数据样本组合来研究暗能量(DE)宇宙学背景下的新广义Chaubergin气体(NGCG)模型。利用已有的宇宙学数据,基于统计马尔可夫链蒙特卡罗方法对NGCG模型的自由参数进行了约束。然后,我们找到了宇宙学参数的最佳拟合值和NGCG宇宙学中的置信区域。我们对NGCG模型中物质密度参数的计算结果与标准CDM宇宙学的结果非常一致。我们还发现,该模型的DE状态方程稍微有利于幻影制度。结果表明,在NGCG模型中,CDM宇宙中出现的高红移观测与低红移观测在预测哈勃常数H0方面的巨大矛盾可以得到缓解。然而,从统计的角度来看,我们的研究结果表明,标准CDM模型比NGCG宇宙学更适合观测。

英文摘要:

We use different combinations of data samples to investigate the new generalized Chaplygin gas (NGCG) model in the context of dark energy (DE) cosmology. Using the available cosmological data, we put constraints on the the free parameters of NGCG model based on the statistical Markov chain Monte Carlo method. We then find the best fit values of cosmological parameters and those confidence regions in NGCG cosmology. Our result for the matter density parameter calculated in NGCG model is in excellent agreement with that of the standard CDM cosmology. We also find that the equation of state of DE of the model slightly favors the phantom regime. We show that the big tension between the low- and high-redshift observations appearing in CDM universe to predict the Hubble constant H 0 can be alleviated in NGCG model. However, from the statistical point of view, our results show that the standard CDM model fits the observations better than the NGCG cosmology.

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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