Observational constraints on phantom-like braneworld cosmologies

Ruth Lazkoz*, Roy Maartens, Elisabetta Majerotto

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationJournal of Physics: Conference Series
Subtitle of host publicationXXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain
Publication statusPublished - 1 May 2007
EventXXIXth Spanish Relativity Meeting: Einstein's Legacy: From the Theoretical Paradise to Astrophysical Observations - Palma, Spain
Duration: 4 Sept 20068 Sept 2006
Conference number: 29th

Publication series

NameJournal of Physics: Conference Series
PublisherIOP Publishing
ISSN (Print)1742-6588


ConferenceXXIXth Spanish Relativity Meeting
Abbreviated titleERE 2006


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