论文标题
lrs bianchi I模型，$ f（r，t）$ dravility持续扩展率
LRS Bianchi I model with constant expansion rate in $f(R,T)$ gravity
论文作者
论文摘要
LRS Bianchi-i时空模型在$ f（r，t）= r+2λt$ gravity中使用恒定哈勃参数进行了研究。尽管考虑了一个（主要的）物质源，但由于物质和$ f（r，t）$重力之间的耦合，出现了另一件事。对于现实的宇宙学场景，即遵守无效和弱的能量条件，获得了约束。该溶液还扩展到标量场（正常或幻影）模型的情况，发现该模型仅与幻影标量片段一致。耦合物质也充当幻影物质。研究表明，如果人们期望从各向异性模型中获得加速的宇宙，那么仅在宇宙进入加速阶段的后期，解决方案就会变得有理由。描绘了$ω（z）$的行为，将一些观察范围放在目前的暗能状态，$ω_0$上，这表明幻影场已经开始占据统治地位，在$ 0.2 \ $ 0.2 \ lyssim z \ Lesssimsim0.5 $之间。
An LRS Bianchi-I space-time model is studied with constant Hubble parameter in $f(R,T)=R+2λT$ gravity. Although a single (primary) matter source is considered, an additional matter appears due to the coupling between matter and $f(R,T)$ gravity. The constraints are obtained for a realistic cosmological scenario, i.e., one obeying the null and weak energy conditions. The solutions are also extended to the case of a scalar field (normal or phantom) model, and it is found that the model is consistent with a phantom scalar field only. The coupled matter also acts as phantom matter. The study shows that if one expects an accelerating universe from an anisotropic model, then the solutions become physically relevant only at late times when the universe enters into an accelerated phase. Placing some observational bounds on the present equation of state of dark energy, $ω_0$, the behavior of $ω(z)$ is depicted, which shows that the phantom field has started dominating very recently, somewhere between $0.2\lesssim z\lesssim0.5$.
