具有时变$G$和衰减$Λ$的凌日宇宙
Transit universe with time varying $G$ and decaying $Λ$
摘要：
在广义相对论框架下，考虑引力耦合$G(t)$和宇宙学项$Λ(t)$，给出了从早期减速阶段到当前加速阶段的凌日宇宙模型.通过考虑与时间有关的减速参数（DP）求解了爱因斯坦场方程，该减速参数使得标度因子$a = (t^{n}e^{kt})^{\frac{1}{m}}$，其中$m$，$n$和$k$为正常数.宇宙学项$(Λ(t))$是正的，并且是时间的减函数，支持了Ia超新星观测的结果。的几何和运动学特征的模型进行了详细研究。
英文摘要：
We present the model of transit universe from early deceleration phase to current acceleration phase under the framework of general relativity in presence of gravitational coupling $G(t)$ and cosmological terms $Λ(t)$. The Einstein's field equations have been solved by considering time dependent deceleration parameter (DP) which renders the scale factor $a = (t^{n}e^{kt})^{\frac{1}{m}}$ where $m$, $n$ and $k$ are positive constants. The cosmological term $(Λ(t))$ is found to be positive and a decreasing function of time which supports the result obtained from supernovae Ia observations. The geometrical and kinematical features of the model are examined in detail.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
