$f(R,T)$引力中的混合流体宇宙模型
Mixed fluid cosmological model in $f(R,T)$ gravity
摘要：
当引力源为正压流体和暗能量的混合物时，采用时变减速参数DP，构造了$f(R,T)$引力理论中的局域旋转对称（LRS）Bianchi Ⅰ型宇宙学模型.我们通过态发现器参数$(r, s)$的行为观察到我们的模型从爱因斯坦静态时代开始到$Λ$ CDM时代。DE的EoS参数（$ω_d$）从体模（$ω<-1$）阶段到精粹（$ω>-1$）阶段变化，这与观察结果一致。结果表明，所讨论的模型可以再现当前宇宙膨胀的加速阶段。
英文摘要：
We construct Locally Rotationally Symmetric (LRS) Bianchi type-I cosmological model in $f(R,T)$ theory of gravity when the source of gravitation is the mixture of barotropic fluid and dark energy (DE) by employing a time varying deceleration parameter (DP). We observe through the behavior of the state finder parameters $(r, s)$ that our model begins from the Einstein static era and goes to $Λ$CDM era. The EoS parameter($ω_d$) for DE varies from phantom ($ω<-1$) phase to quintessence ($ω>-1$) phase which is consistent with the observational results. It is found that the discussed model can reproduce the current accelerating phase of expansion of the universe.
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