Observational constraints on phantomlike braneworld cosmologies

R. Lazkoz, Roy Maartens, E. Majerotto

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Abstract

We investigate a simple braneworld model in which the universe contains only cold dark matter and a cosmological constant, but the effective dark energy is phantomlike because of extra-dimensional gravity effects. Modified gravity screens the cosmological constant Λ, allowing for a larger Λ. In practice, observations do not favor any significant screening. We use supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution to constrain the model. We find the mean value of Ωm with 68% confidence limits, and an upper limit on ΩΛ at the 68% confidence level. The best-fit model is very close to a standard LCDM model, but the LCDM model provides a better fit since it has one less parameter
Original languageEnglish
Pages (from-to)083510
Number of pages1
JournalPhysical Review D
Volume74
Issue number8
DOIs
Publication statusPublished - 15 Oct 2006

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