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arXiv 1907.04625gr-qc
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能量动量张量相关的爱因斯坦场方程的迹的迹

The trace of the trace of the energy-momentum tensor-dependent Einstein's field equations

P. H. R. S. Moraes

摘要:

$f(R,T)$重力场方程一般依赖于Ricci标量$R$和能量动量张量$T$的迹。在理想流体的假设下,该理论在物质拉格朗日密度$\mathcal{L}$的选择上具有任意性,没有唯一的定义。这种任意性可以通过研究理论场方程的迹来避免。从这样一个方程,可以得到$\mathcal{L}$的一种形式,它不带有任意性。得到的$\mathcal{L}$的形式表明$f(R,T)$引力是幺模的。一个新版本的理论,因此,提出和即将到来的应用程序。

英文摘要:

The $f(R,T)$ gravity field equations depend generically on both the Ricci scalar $R$ and trace of the energy-momentum tensor $T$. Within the assumption of perfect fluids, the theory carries an arbitrariness regarding the choice of the matter lagrangian density $\mathcal{L}$, not uniquely defined. Such an arbitrariness can be evaded by working with the trace of the theory field equations. From such an equation, one can obtain a form for $\mathcal{L}$, which does not carry the arbitrariness. The obtained form for $\mathcal{L}$ shows that the $f(R,T)$ gravity is unimodular. A new version of the theory is, therefore, presented and forthcoming applications are expected.

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