Observational constraints on phantom-like braneworld cosmologies

Details Observational constraints on phantom-like braneworld cosmologies Observational constraints on phantom-like braneworld cosmologies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jphcs..66a2057l&link_type=abstract

Journal of Physics: Conference Series, Volume 66, Issue 1, pp. 012057 (2007).

Physics

2

Scientific paper

We study a simple braneworld model in which the universe is filled solely with cold dark matter and a cosmological constant, although the effective dark energy is phantom-like due extra-dimensional gravity effects. Theoretically the cosmological constant Λ is screened by modified gravity, so that a larger Λ can be accommodated, but actually observations do not seem to favour any screening significantly. Using supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution we set constrains to the model. We find the mean value of Ωm with 68% confidence limits, and an upper limit on ΩΛ at the 68% confidence level. We conclude the best-fit model is very close to a standard LCDM model, but the LCDM model represents a better fit since it has one less parameter.

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