Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Cosmology with Variable G and Nonlinear Electrodynamics

Version 1 : Received: 1 July 2020 / Approved: 2 July 2020 / Online: 2 July 2020 (12:56:22 CEST)
Version 2 : Received: 7 July 2020 / Approved: 9 July 2020 / Online: 9 July 2020 (16:02:47 CEST)

How to cite: Joseph, G.W.; Övgün, A. Cosmology with Variable G and Nonlinear Electrodynamics. Preprints 2020, 2020070005 (doi: 10.20944/preprints202007.0005.v2). Joseph, G.W.; Övgün, A. Cosmology with Variable G and Nonlinear Electrodynamics. Preprints 2020, 2020070005 (doi: 10.20944/preprints202007.0005.v2).

Abstract

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 varying with cosmic time. In this paper we have study cosmology in nonlinear electrodynamics with the Newton's gravitational constant $G$ not a constant but vary in form of power-law of the scale factor of the universe. The evolution of the scale factor $a (t)$ is studied in this model which depends on nonlinear electrodynamics fine tuning term of $\alpha$. Then we check the stability of the model using the speed of sound.

Subject Areas

Cosmology; nonlinear electrodynamics; inflation; acceleration of the universe; causality; classical stability; variable $G$

Comments (1)

Comment 1
Received: 9 July 2020
Commenter: Ali Övgün
Commenter's Conflict of Interests: Author
Comment: -typos are corrected
-more discussion are added.

best regards,
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