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Scalar mode propagation in modified gravity with a scalar field

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  • Additional Information
    • Contributors:
      UCL - SC/PHYS - Département de physique
    • Publication Date:
      2009
    • Collection:
      DIAL@UCL (Université catholique de Louvain)
    • Abstract:
      We study the propagation of the scalar modes around a Friedmann-Lemaitre-Robertson-Walker universe for general modifications of gravity in the presence of a real scalar field. In general, there will be two propagating scalar perturbation fields, which will have in total four degrees of freedom. Two of these degrees will have a superluminal propagation--with k-dependent speed of propagation--whereas the other two will travel with the speed of light. Therefore, the scalar degrees of freedom do not modify the general feature of modified gravity models: the appearance of modes whose frequency depends on the second power of the modulus of the wave vector. Constraints are given and special cases are discussed. Comment: 13 pages, 1 figure, uses RevTeX
    • ISSN:
      1089-4918
      1550-7998
    • Relation:
      boreal:31231; http://hdl.handle.net/2078/31231; urn:EISSN:1089-4918; urn:ISSN:1550-7998
    • Accession Number:
      10.1103/PhysRevD.80.083523
    • Online Access:
      http://hdl.handle.net/2078/31231
      https://doi.org/10.1103/PhysRevD.80.083523
    • Rights:
      info:eu-repo/semantics/openAccess
    • Accession Number:
      edsbas.C44F0648