We have investigated some cosmic transit models in the framework of an extended gravity theory where the usual Ricci scalar in the gravitational action is replaced by a sum of the Ricci scalar and a term proportional to the trace of the energy momentum tensor. A hybrid scale factor is assumed to simulate the cosmic transit behaviour. The hybrid scale factor has two parameters that describe the behaviour of the model at an initial epoch and at a late epoch. The parameters of the hybrid scale factor have been constrained from the cosmic transit behaviour. Four different cosmic transit models have been constructed and are confronted with the observational Hubble parameter data. A cosmographic test for the cosmic transit models is conducted to assess their dynamical evolution. The effect of the model parameters on the cosmic dynamics has been investigated.

我们已经在扩展引力理论的框架内研究了一些宇宙凌日模型，其中引力作用中通常的 Ricci 标量被 Ricci 标量和与能量动量张量的迹线成正比的项的总和所取代。假设使用混合比例因子来模拟宇宙凌日行为。混合比例因子有两个参数，用于描述模型在初始时期和后期时期的行为。混合比例因子的参数已受到宇宙凌日行为的约束。已经构建了四种不同的宇宙凌日模型，并面对哈勃观测参数数据。对宇宙凌日模型进行了宇宙学测试，以评估它们的动力学演化。