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Cosmological Consequences with Time Dependent Λ-Term in Bianchi Type-I Space-Time

机译:Bianchi I型时空中具有时间依赖性Λ项的宇宙学后果

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The Einstein’s field equations with variable cosmological “constant” are considered in presence of perfect fluid for a homogeneous and anisotropic Bianchi type-I space-time. Einstein’s field equations are exactly solved by considering scale factor a(t) = te^t (Pradhan et al. in Rom. J. Phys. 57: 2012) which yields a time-dependent deceleration parameter (DP), representing models which generate accelerating phase at the present epoch. The cosmological constant Λ is found to be a decreasing function of time and it approaches a small positive value at the present epoch which is corroborated by consequences from recent supernovae Ia observations. From recently developed Statefinder pair, the behaviour of different stages of the evolution of the universe has been studied. The physical and geometric implications of the cosmological models have also been discussed.
机译:对于均匀且各向异性的Bianchi I型时空,在存在完美流体的情况下考虑了具有可变宇宙学“常数”的爱因斯坦场方程。通过考虑比例因子a(t)= te ^ t(Pradhan等人,Rom。J. Phys。57:2012)可以精确求解爱因斯坦的场方程,该方程会产生随时间变化的减速度参数(DP),代表生成模型在当前时代的加速阶段。发现宇宙常数Λ是时间的递减函数,在当前时期它接近一个小的正值,这由最近的超新星Ia观测的结果所证实。从最近开发的Statefinder对中,已经研究了宇宙演化的不同阶段的行为。还讨论了宇宙学模型的物理和几何意义。

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