Solutions of Cosmological Models With Varying Speed of Light

Câmara, C. S.; Nascimento, R. B.; Carvalho, J. C.; Maia, M. R. de Garcia

doi:10.1142/s0218271807010225

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…These models are oversimplified and are not the only theories regarding the future state of the universe. The oscillatory model, or The Big Bounce, conflates these two theories, postulating that the universe is in a perpetual state of expansion and implosion (see Ellis, Murugan, and Tsagas 2004;Wang et al 2004;Tolman 1987, 361-419;Câmara et al 2007;Reddy, Rao, and Rao 2006;Debnath and Paul 2006;Xu, Liuy, and Zhang 2006;Khadekar and Patki 2005).…”

Section: Notesmentioning

confidence: 99%

A Pentecostal Perspective on Entropy, Emergent Systems, and Eschatology

Bradnick

2008

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Many contemporary theologies have given considerable attention to the inbreaking work of God whereby the Spirit imbues creation with life and vitality, but in the process the seriousness of the destructive forces that plague the world has been overlooked. This oversight not only has significant theological consequences, but it also generates a tension with scientific postulates about physical reality. Paradoxically, increasing complexity, including emergent life systems, arise in spite of the overarching conditions. I posit from a theological perspective that the Spirit acts within the world to generate pockets of organization out of disorder. The Spirit not only was present and active at initial creation but also continues to act within the cosmos, sustaining the natural order and giving rise to innovative acts of creation. The world, which groans for and anticipates transformation, experiences local decreases in entropy as proleptic events of God's inbreaking kingdom. This theological hypothesis provides the framework for considering an eschatological response to the world's decay.

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Section: Notesmentioning

confidence: 99%

A Pentecostal Perspective on Entropy, Emergent Systems, and Eschatology

Bradnick

2008

Zygon

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“…Recently, interest is being geared towards cosmological models in which physical constants of nature are varying with time [46][47][48]. For instance, in the varying speed of light (VSL) theories, where the speed of light is spatial, temporal and wavelength-dependent, most pending problems of standard cosmological models are being resolved without considering inflation [49][50][51]. The VSL theories, which deal with the shortcomings of inflation, have not address issues related to the initial big bang singularity.…”

Section: Introductionmentioning

confidence: 99%

Cosmology with variable $G$ and nonlinear electrodynamics

Joseph,

Övgün

2021

Preprint

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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.

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“…In recent times, interest is geared towards cosmological models in which physical constants of nature are varying with time [42][43][44]. For instance, in the VSL theory, most pending problems of standard cosmological models are being resolved with considering inflation [45][46][47]. In the Einstein's field equation, the Newton's gravitational constant G acts as a coupling constant between geometry of spacetime and matter.…”

Section: Introductionmentioning

confidence: 99%

Cosmology with Variable <em>G</em> and Nonlinear Electrodynamics

Joseph¹,

Овгун²

2020

Preprint

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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 study cosmology in nonlinear electrodynamics with the Newton's gravitational constant $G$ not a constant but varies with the scale factor of the universe. The evolution of the scale factor $a(t)$ in this model depends on $\alpha$, which gives an steady universe when $\alpha=0.5$. As $\alpha$ increases to $\alpha=1.0, 1.5, 2.0, 3.0$ the universe enter into inflation scenario after that the magnetic monopole field decayed and is converted to radiation. We checked the stability of the model and obtained that it is classically stable with the best condition for the stability at $5/2\geq \alpha >7/4$ .

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Solutions of Cosmological Models With Varying Speed of Light

Cited by 9 publications

References 11 publications

A Pentecostal Perspective on Entropy, Emergent Systems, and Eschatology

A Pentecostal Perspective on Entropy, Emergent Systems, and Eschatology

Cosmology with variable $G$ and nonlinear electrodynamics

Cosmology with Variable <em>G</em> and Nonlinear Electrodynamics

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