Phantom Energy with Variable G and Λ

Details Phantom Energy with Variable G and Λ Phantom Energy with Variable G and Λ

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1115..230a&link_type=abstract

THE DARK SIDE OF THE UNIVERSE: 4th International Workshop on the Dark Side of the Universe. AIP Conference Proceedings, Volume

Mathematics

Logic

Cosmology, Dark Matter, Supernova Remnants

Scientific paper

We have investigated a cosmological model of a phantom energy with a variable cosmo-logical 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 matter (or dark matter), 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 -23<α<0 and Λ>0.

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