关于"重新检查$f\left(R,T\right)$重力"的评论，物理修订版D 100，064059（2019）
Comment on "Reexamining $f\left(R,T\right)$ gravity", Phys. Rev. D 100, 064059 (2019)
摘要：
在S. B. Fisher和E. D. Carlson，Phys. Rev. D 100，064059（2019），作者声称，对于特定的$f(R,T)$修改的重力模型，使用$f(R,T)=f_1(R)+f_2(T)$，术语$f_2(T)$必须包含在物质拉格朗日中，因此它没有任何物理意义。我们仔细重新审视的推理线中提出的文件，我们表明，有几个主要的概念问题有关的作者的物理解释，以及在物理和数学方法来推导能量动量张量的理论。这些问题提出了一些严重的关注的有效性，本文中提出的大多数结果。
英文摘要：
In a recent paper, "Reexamining $f\left(R,T\right)$ gravity", by S. B. Fisher and E. D. Carlson, Phys. Rev. D 100, 064059 (2019), the authors claim that for the particular $f(R,T)$ modified gravity model, with $f(R,T)=f_1(R)+f_2(T)$, the term $f_2(T)$ must be included in the matter Lagrangian and therefore it does not have any physical significance. We carefully reexamine the line of reasoning presented in the paper, and we show that there are several major conceptual problems related to the author's physical interpretations, as well as in the physical and mathematical approaches used to derive the energy-momentum tensor of the theory. These problems raise some serious concerns about the validity of most of the results presented in the paper.
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