Cosmology with variable G and nonlinear electrodynamics

Gabriel W. Joseph, Ali Övgün

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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, α. Finally, we verify the stability of the model using the speed of sound.

Original languageEnglish
Pages (from-to)1861-1866
Number of pages6
JournalIndian Journal of Physics
Issue number6
StatePublished - May 2022
Externally publishedYes


  • Acceleration of the universe
  • Causality
  • Classical stability
  • Cosmology
  • Inflation
  • Nonlinear electrodynamics
  • Variable G


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