Preprint Article Version 3 Preserved in Portico This version is not peer-reviewed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)
Version 3 : Received: 13 April 2021 / Approved: 14 April 2021 / Online: 14 April 2021 (14:07:07 CEST)

A peer-reviewed article of this Preprint also exists.

Indian J Phys (2021) Indian J Phys (2021)

Journal reference: Indian Journal of Physics 2021
DOI: 10.1007/s12648-021-02110-4

## 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.

## Keywords

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

## Subject

PHYSICAL SCIENCES, Acoustics

Comment 1
Received: 14 April 2021
Commenter: Ali Övgün
Commenter's Conflict of Interests: Author
Comment: - We have improved the introduction and conclusion parts.
- Typos are corrected.
-References are updated.
Best Regards,
Thank you very much,

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