论文标题
（2+1）$λ$（r; t）在F（r; t）重力中的尺寸宇宙学模型
(2+1) dimensional cosmological models in f(R; T) gravity with $Λ$(R; T)
论文作者
论文摘要
We intend to study a new class of cosmological models in $f(R, T)$ modified theories of gravity, hence define the cosmological constant $Λ$ as a function of the trace of the stress energy-momentum-tensor $T$ and the Ricci scalar $R$, and name such a model "$Λ(R, T)$ gravity" where we have specified a certain form of $Λ(R, T)$. $λ（r，t）$也在完美的液体和灰尘盒中定义。还讨论了模型的某些物理和几何特性。当$λ$是正常常数时，并且当$λ=λ（t）$，即宇宙学时间的函数时，都会研究压力，密度和能量条件。我们研究了一些宇宙学数量的行为，例如哈勃和减速参数。从$ r $和$ t $进行描述的意义上说，该模型具有创新性，并且可以更好地了解宇宙学观察。
We intend to study a new class of cosmological models in $f(R, T)$ modified theories of gravity, hence define the cosmological constant $Λ$ as a function of the trace of the stress energy-momentum-tensor $T$ and the Ricci scalar $R$, and name such a model "$Λ(R, T)$ gravity" where we have specified a certain form of $Λ(R, T)$. $Λ(R, T)$ is also defined in the perfect fluid and dust case. Some physical and geometric properties of the model are also discussed. The pressure, density and energy conditions are studied both when $Λ$ is a positive constant and when $Λ=Λ(t)$, i.e a function of cosmological time, t. We study the behaviour of some cosmological quantities such as Hubble and deceleration parameters. The model is innovative in the sense that it has been described in terms of both $R$ and $T$ and display a better understanding of the cosmological observations.
