Testing a varying-Λ model for dark energy within co-varying physical couplings framework Article Swipe

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R. R. Cuzinatto , Rajendra P. Gupta , R. F. L. Holanda , J. F. Jesus , S. H. Pereira ·

YOU? · · 2022 · Open Access · · DOI: https://doi.org/10.1093/mnras/stac2039

The Co-varying Physical Couplings (CPC) framework is a modified gravity set up assuming Einstein Field Equations wherein the quantities {G, c, Λ} are promoted to space–time functions. Bianchi identity and the requirement of stress-energy tensor conservation entangle the possible variations of the couplings {G, c, Λ}, which are forced to co-vary as dictated by the General Constraint (GC). In this paper, we explore a cosmological model wherein G, c, and Λ are functions of the redshift respecting the GC of the CPC framework. We assume a linear parametrization of Λ in terms of the scale factor a. We use the ansatz $\dot{G}/G = \sigma \left(\dot{c}/c \right)$ with σ = constant to deduce the functional forms of c = c(z) and G = G(z). We show that this varying-{G, c, Λ} model fits SNe Ia data and H(z) data with σ = 3. The model parameters can be constrained to describe dark energy at the background level.

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Ansatz Dark energy Physics Parametrization (atmospheric modeling) Tensor (intrinsic definition) Redshift Einstein Mathematical physics Constraint (computer-aided design) Cosmological constant Theoretical physics Astrophysics Quantum mechanics Cosmology Pure mathematics Geometry Mathematics Radiative transfer Galaxy

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Type: article
Language: en
Landing Page: https://doi.org/10.1093/mnras/stac2039
OA Status: green
Cited By: 16
References: 122
Related Works: 10
OpenAlex ID: https://openalex.org/W4286790039

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DOI: https://doi.org/10.1093/mnras/stac2039

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Title: Testing a varying-Λ model for dark energy within co-varying physical couplings framework

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Language: en

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Publication year: 2022

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Publication date: 2022-07-23

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Authors: R. R. Cuzinatto, Rajendra P. Gupta, R. F. L. Holanda, J. F. Jesus, S. H. Pereira

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Landing page: https://doi.org/10.1093/mnras/stac2039

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Concepts: Ansatz, Dark energy, Physics, Parametrization (atmospheric modeling), Tensor (intrinsic definition), Redshift, Einstein, Mathematical physics, Constraint (computer-aided design), Cosmological constant, Theoretical physics, Astrophysics, Quantum mechanics, Cosmology, Pure mathematics, Geometry, Mathematics, Radiative transfer, Galaxy

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Cited by: 16

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