| Phantom Energy with Variable G and Λ |
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| 基金项目： | I would like to thank M. Jamil for useful communication. |
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| 摘 要： | We investigate a cosmological model of a phantom energy with a variable cosmological constant （∧） depending on the energy density （ρ） as ∧∝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 ∧ ∝ t^-2. For ω 〉 - 1 and α 〈 -1 the cosmological constant ∧ 〈 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 p decreases with time. Cosmic acceleration with dust particles is granted, provided -2/3 〈α〈 0 and ∧〉0.
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| 关 键 词： | 物理学 重力 引力 变量 研究 |
| 收稿时间： | 2008-03-27 |
Phantom Energy with Variable G and A |
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| Arbab I. Arbab. Phantom Energy with Variable G and A[J]. Chinese Physics Letters, 2008, 25(12): 4497-4500 |
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| Authors: | Arbab I. Arbab |
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| Affiliation: | Department of Physics, Faculty of Science, University of Khartoum, P.O. Box 321, Khartoum 11115, SudanDepartment of Physics and Applied Mathematics, Faculty of Applied Sciences and Computer, Omdurman Ahlia University, P.O. Box 786, Omdurman, Sudan |
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| Abstract: | |
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| Keywords: | 98.80.Cq 95.36.+x 98.80.Es |
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