FLRW Transit Cosmological Model in F (R,T) Gravity

Singh, Vijay; Jokweni, Siwaphiwe; Beesham, Aroonkumar

doi:10.20944/preprints202402.1621.v1

2024

DOI: 10.20944/preprints202402.1621.v1

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FLRW Transit Cosmological Model in F (R,T) Gravity

Vijay Singh,

Siwaphiwe Jokweni,

Aroonkumar Beesham

Abstract: A Friedmann-Lemaitre-Robertson-Walker space-time model with all curvatures k=0,±1 is explored in f(R,T) gravity. The solutions are obtained via the parametrization of the scale factor that leads to a model transiting from a decelerated universe to an accelerating one. The physical features of the model are discussed and analysed.

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Cited by 2 publications

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Centenary of Alexander Friedmann’s Prediction of Universe Expansion and the Prospects of Modern Cosmology

Klimchitskaya,

Mostepanenko,

Sushkov

2024

Universe

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In this Editorial to the Special Issue “The Friedmann Cosmology: A Century Later”, we consider an outstanding character of Friedmann’s prediction of Universe expansion, which laid the foundation of modern cosmology. The list of the main discoveries made in cosmology during the last one hundred years is followed by a formulation of the standard cosmological model. The articles contributing to the Special Issue are considered in relation to this model, and to several alternative theoretical approaches. Special attention is paid to unresolved problems, such as the nature of dark matter and dark energy, Hubble tension and the pre-inflationary stage of the Universe evolution. The conclusion is made that astrophysics and cosmology are on the threshold of new fundamental discoveries.

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Centenary of Alexander Friedmann’s Prediction of Universe Expansion and the Prospects of Modern Cosmology

Klimchitskaya,

Mostepanenko,

Sushkov

2024

Universe

View full text Add to dashboard Cite

show abstract

The Variation of G and Λ in Cosmology

Beesham

2024

Universe

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The idea of varying constants of nature is very old, and has commanded a lot of attention since first mooted. The variation in the gravitational parameter G and cosmological parameter Λ is still an active area of research. Since the idea of a varying G was introduced by Dirac almost a century ago, there are even theories that have variable G such as the Brans–Dicke theory and the scale covariant theory. Both these theories also have a varying Λ in their full generalisations. A varying Λ was also introduced around the same time as that of varying G. It is interesting to note that a possible solution to the cosmological constant problem can be realised from a dynamic Λ. In this work, we focus on a varying Λ and G framework. In almost all studies in the simplest framework of variables Λ and G, it is found that one of them has to increase with time. However, observations and theoretical considerations indicate that both Λ and G should decrease with time. In this paper, we propose a solution to this problem, finding theories in which both Λ and G decrease with time.

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FLRW Transit Cosmological Model in F (R,T) Gravity

Cited by 2 publications

References 38 publications

Centenary of Alexander Friedmann’s Prediction of Universe Expansion and the Prospects of Modern Cosmology

Centenary of Alexander Friedmann’s Prediction of Universe Expansion and the Prospects of Modern Cosmology

The Variation of G and Λ in Cosmology

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