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Behaviour of viscous fluid in string cosmological models in the framework of Lyra geometry
New Astronomy ( IF 2 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.newast.2021.101611
Mahbubur Rahman Mollah , Kangujam Priyokumar Singh

In this communication, we studied the aspects of bulk viscous fluid cosmological model with quadratic equation of state in the presence of strings loaded with particles in a higher dimensional (5- dimensional) Bianchi type-III geometry in Lyra’s Manifold (Lyra, 1951). Using physically plausible circumstances, an exact model of the universe is presented by obtaining the solutions of the Einstein’s field equations. Important geometrical and dynamical parameters of the model universes are premeditated and physical significance regarding their prospect in modern cosmology are discussed in details. Interestingly it is seen that both bulk viscosity and quadratic equation of state are acting crucial jobs throughout the evolution of the model which is expanding with acceleration so it represents dark energy model universe. Hence our model can be thought as a realistic universe.



中文翻译:

天琴座几何学框架中粘性流体在弦宇宙模型中的行为

在本交流中,我们研究了在状态系数为2的状态下,在Lyra's Manifold(Lyra,1951)中以较高维(5维)的Bianchi III型几何形状加载粒子的弦的情况下,具有二次状态方程的整体粘性流体宇宙学模型的各个方面。在物理上合理的情况下,通过获得爱因斯坦场方程的解,可以给出一个精确的宇宙模型。对模型宇宙的重要几何和动力学参数进行了预谋,并对它们在现代宇宙学中的前景进行了物理意义的详细讨论。有趣的是,在模型的整个演化过程中,体粘度和二次状态方程都起着至关重要的作用,该模型随着加速度而扩展,因此代表了暗能量模型的宇宙。

更新日期:2021-05-08
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