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Cosmology with variable G and nonlinear electrodynamics
Indian Journal of Physics ( IF 2 ) Pub Date : 2021-04-20 , DOI: 10.1007/s12648-021-02110-4
Gabriel W. Joseph , Ali Övgün

In a bid to resolve lingering problems in cosmology, more focus is being tilted towards cosmological models in which physical constants of nature are not necessarily real constants but vary with cosmic time. In this paper, we study a cosmological model in nonlinear electrodynamics with Newton’s gravitational constant G, which is not a constant but varies in terms of a power law of the scale factor of the universe. Hence, the evolution of the scale factor a(t) is studied in this model, which depends on a fine-tuning term of nonlinear electrodynamics, \(\alpha \). Finally, we verify the stability of the model using the speed of sound.



中文翻译:

具有可变G和非线性电动力学的宇宙学

为了解决宇宙学中的挥之不去的问题,人们将更多的注意力转向宇宙学模型,在该模型中,自然的物理常数不一定是实数,而是随宇宙时间而变化。在本文中,我们研究具有牛顿引力常数G的非线性电动力学的宇宙学模型,该常数不是常数,而是根据宇宙比例因子的幂定律而变化。因此,在该模型中研究了比例因子at)的演化,该演化取决于非线性电动力学的微调项\(\ alpha \)。最后,我们使用声速验证模型的稳定性。

更新日期:2021-04-20
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