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arXiv 1802.06358gr-qc
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对Brans-Dicke变色龙宇宙学中$^"$宇宙演化的评论$^"$

Comments on $^"$Cosmic evolution in Brans-Dicke chameleon cosmology$^"$

Haidar Sheikhahmadi

摘要:

参考文献\cite{1-2}的作者在标量张量引力的外部相互作用模型(Brans Dicke变色龙方案)中研究了宇宙演化。这项工作的程序包含一些新的东西,但是,从这一评论中可以看出,他们的报告面临着三个根本性的缺陷。其中一个是关于能量守恒方程,另外两个是关于数学错误。在标量张量引力模型中,为了得到守恒方程,一个著名的方法是将Friedmann方程和修正的Klein-Gordon方程结合起来。但在文献\cite{1-2}中,用这种方法不能得到守恒方程的正确结果。此外,人们很容易认识到,他们的数学错误导致与本报告不同的结果。

英文摘要:

The authors of Ref. \cite{1-2}, investigated cosmic evolution in an external interacting model of scalar tensor gravity namely Brans Dicke chameleon scenario. The procedure of this work contains novelties but, it shall be observed from this comment, their report faces three fundamental drawbacks. One of them concerns the energy conservation equation, and the other two flaws are about mathematical mistakes. In the scalar tensor gravity models, a well-known method, in order to obtain conservation equation one must combine Friedmann equations with modified Klein-Gordon equation. But in Ref. \cite{1-2}, by virtue of the mentioned approach one would not be able to achieve a correct result for conservation equation. In addition, one can readily realize that their mathematical mistakes lead to different results compared to the present report.

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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