Phantomlike behavior in a brane-world model with curvature effects

Bouhmadi-Lopez, Mariam; Moniz, Paulo Vargas

doi:10.1103/PHYSREVD.78.084019

Title: Phantomlike behavior in a brane-world model with curvature effects

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Abstract

Recent observational evidence seems to allow the possibility that our Universe may currently be under a dark energy effect of a phantom nature. A suitable effective phantom fluid behavior can emerge in brane cosmology; in particular, within the normal non-self-accelerating Dvali-Gabadadze-Porrati branch, without any exotic matter and due to curvature effects from induced gravity. The phantomlike behavior is based in defining an effective energy density that grows as the brane expands. This effective description breaks down at some point in the past when the effective energy density becomes negative and the effective equation of state parameter blows up. In this paper we investigate if the phantomlike regime can be enlarged by the inclusion of a Gauss-Bonnet (GB) term into the bulk. The motivation is that such a GB component would model additional curvature effects on the brane setting. More precisely, our aim is to determine if the GB term, dominating and modifying the early behavior of the brane universe, may eventually extend the regime of validity of the phantom mimicry on the brane. However, we show that the opposite occurs: the GB effect seems instead to induce a breakdown of the phantomlike behavior at an even smaller redshift.

Authors:

Bouhmadi-Lopez, Mariam ^[1]; Moniz, Paulo Vargas ^[1]

Centro Multidisciplinar de Astrofisica - CENTRA, Departamento de Fisica, Instituto Superior Tecnico, Av. Rovisco Pais 1, 1049-001 Lisboa (Portugal)

Publication Date:: Wed Oct 15 00:00:00 EDT 2008

OSTI Identifier:: 21254444

Resource Type:: Journal Article

Journal Name:: Physical Review. D, Particles Fields

Additional Journal Information:: Journal Volume: 78; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.78.084019; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGY; ENERGY DENSITY; EQUATIONS OF STATE; FLUIDS; GRAVITATION; NONLUMINOUS MATTER; PHANTOMS; RED SHIFT; SIMULATION; UNIVERSE

Citation Formats


                    Bouhmadi-Lopez, Mariam, Moniz, Paulo Vargas, and Departamento de Fisica, Universidade da Beira Interior, Rua Marques d'Avila e Bolama, 6201-001 Covilha. Phantomlike behavior in a brane-world model with curvature effects.  United States: N. p., 2008. 
        Web.  doi:10.1103/PHYSREVD.78.084019.

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                    Bouhmadi-Lopez, Mariam, Moniz, Paulo Vargas, & Departamento de Fisica, Universidade da Beira Interior, Rua Marques d'Avila e Bolama, 6201-001 Covilha. Phantomlike behavior in a brane-world model with curvature effects.  United States.  https://doi.org/10.1103/PHYSREVD.78.084019

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                    Bouhmadi-Lopez, Mariam, Moniz, Paulo Vargas, and Departamento de Fisica, Universidade da Beira Interior, Rua Marques d'Avila e Bolama, 6201-001 Covilha. 2008.  
        "Phantomlike behavior in a brane-world model with curvature effects".  United States.  https://doi.org/10.1103/PHYSREVD.78.084019.

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@article{osti_21254444,

  title        = {Phantomlike behavior in a brane-world model with curvature effects},

  author       = {Bouhmadi-Lopez, Mariam and Moniz, Paulo Vargas and Departamento de Fisica, Universidade da Beira Interior, Rua Marques d'Avila e Bolama, 6201-001 Covilha},

  abstractNote = {Recent observational evidence seems to allow the possibility that our Universe may currently be under a dark energy effect of a phantom nature. A suitable effective phantom fluid behavior can emerge in brane cosmology; in particular, within the normal non-self-accelerating Dvali-Gabadadze-Porrati branch, without any exotic matter and due to curvature effects from induced gravity. The phantomlike behavior is based in defining an effective energy density that grows as the brane expands. This effective description breaks down at some point in the past when the effective energy density becomes negative and the effective equation of state parameter blows up. In this paper we investigate if the phantomlike regime can be enlarged by the inclusion of a Gauss-Bonnet (GB) term into the bulk. The motivation is that such a GB component would model additional curvature effects on the brane setting. More precisely, our aim is to determine if the GB term, dominating and modifying the early behavior of the brane universe, may eventually extend the regime of validity of the phantom mimicry on the brane. However, we show that the opposite occurs: the GB effect seems instead to induce a breakdown of the phantomlike behavior at an even smaller redshift.},

  doi          = {10.1103/PHYSREVD.78.084019},

  url          = {https://www.osti.gov/biblio/21254444},
  journal      = {Physical Review. D, Particles Fields},

  issn         = {0556-2821},

  number       = 8,

  volume       = 78,

  place        = {United States},

  year         = {Wed Oct 15 00:00:00 EDT 2008},

  month        = {Wed Oct 15 00:00:00 EDT 2008}

}

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