University of Khartoum

Phantom Energy with Variable G and A

Phantom Energy with Variable G and A

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Title: Phantom Energy with Variable G and A
Author: Arbab, Arbab I.
Abstract: We investigate a cosmological model of a phantom energy with a variable cosmological constant (Λ) depending on the energy density (ρ) as Λ ∝ ρ−α, α = const and a variable gravitational constant G. The model requires α < 0 and a negative gravitational constant. The cosmological constant evolves with time as Λ ∝ t−2. For ω > −1 and α < −1 the cosmological constant Λ < 0, G > 0 and ρ decrease with cosmic expansion. For ordinary energy (or dark energy), i.e., ω > −1 we have −1 < α < 0 and β > 0 so that G > 0 increases with time and ρ decreases with time. Cosmic acceleration with dust particles is granted, provided −2/3 < α < 0 and Λ > 0.
URI: http://khartoumspace.uofk.edu/handle/123456789/17598
Date: 2015-12-14


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