## Abstract

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 Ω_{m} with 68% confidence limits, and an upper limit on Ω_{Λ} 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 language | English |
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Title of host publication | Journal of Physics: Conference Series |

Subtitle of host publication | XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain |

Volume | 66 |

Edition | 1 |

DOIs | |

Publication status | Published - 1 May 2007 |

Event | XXIXth Spanish Relativity Meeting: Einstein's Legacy: From the Theoretical Paradise to Astrophysical Observations - Palma, Spain Duration: 4 Sep 2006 → 8 Sep 2006 Conference number: 29th |

### Publication series

Name | Journal of Physics: Conference Series |
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Publisher | IOP Publishing |

ISSN (Print) | 1742-6588 |

### Conference

Conference | XXIXth Spanish Relativity Meeting |
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Abbreviated title | ERE 2006 |

Country/Territory | Spain |

City | Palma |

Period | 4/09/06 → 8/09/06 |