Cosmic acceleration and the helicity-0 graviton

Claudia De Rham, Gregory Gabadadze, Lavinia Heisenberg, David Pirtskhalava

    Research output: Contribution to journalArticle

    Abstract

    We explore cosmology in the decoupling limit of a nonlinear covariant extension of Fierz-Pauli massive gravity obtained recently in arXiv:1007.0443. In this limit the theory is a scalar-tensor model of a unique form defined by symmetries. We find that it admits a self-accelerated solution, with the Hubble parameter set by the graviton mass. The negative pressure causing the acceleration is due to a condensate of the helicity-0 component of the massive graviton, and the background evolution, in the approximation used, is indistinguishable from the ΛCDM model. Fluctuations about the self-accelerated background are stable for a certain range of parameters involved. Most surprisingly, the fluctuation of the helicity-0 field above its background decouples from an arbitrary source in the linearized theory. We also show how massive gravity can remarkably screen an arbitrarily large cosmological constant in the decoupling limit, while evading issues with ghosts. The obtained static solution is stable against small perturbations, suggesting that the degravitation of the vacuum energy is possible in the full theory. Interestingly, however, this mechanism postpones the Vainshtein effect to shorter distance scales. Hence, fifth force measurements severely constrain the value of the cosmological constant that can be neutralized, making this scheme phenomenologically not viable for solving the old cosmological constant problem. We briefly speculate on a possible way out of this issue.

    Original languageEnglish (US)
    Article number103516
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume83
    Issue number10
    DOIs
    StatePublished - May 11 2011

    Fingerprint

    gravitons
    decoupling
    gravitation
    ghosts
    cosmology
    condensates
    tensors
    scalars
    perturbation
    vacuum
    symmetry
    approximation
    energy

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Cosmic acceleration and the helicity-0 graviton. / De Rham, Claudia; Gabadadze, Gregory; Heisenberg, Lavinia; Pirtskhalava, David.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 83, No. 10, 103516, 11.05.2011.

    Research output: Contribution to journalArticle

    De Rham, Claudia ; Gabadadze, Gregory ; Heisenberg, Lavinia ; Pirtskhalava, David. / Cosmic acceleration and the helicity-0 graviton. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2011 ; Vol. 83, No. 10.
    @article{4234fad6a3be4c7bab3672ea2d8d1e1e,
    title = "Cosmic acceleration and the helicity-0 graviton",
    abstract = "We explore cosmology in the decoupling limit of a nonlinear covariant extension of Fierz-Pauli massive gravity obtained recently in arXiv:1007.0443. In this limit the theory is a scalar-tensor model of a unique form defined by symmetries. We find that it admits a self-accelerated solution, with the Hubble parameter set by the graviton mass. The negative pressure causing the acceleration is due to a condensate of the helicity-0 component of the massive graviton, and the background evolution, in the approximation used, is indistinguishable from the ΛCDM model. Fluctuations about the self-accelerated background are stable for a certain range of parameters involved. Most surprisingly, the fluctuation of the helicity-0 field above its background decouples from an arbitrary source in the linearized theory. We also show how massive gravity can remarkably screen an arbitrarily large cosmological constant in the decoupling limit, while evading issues with ghosts. The obtained static solution is stable against small perturbations, suggesting that the degravitation of the vacuum energy is possible in the full theory. Interestingly, however, this mechanism postpones the Vainshtein effect to shorter distance scales. Hence, fifth force measurements severely constrain the value of the cosmological constant that can be neutralized, making this scheme phenomenologically not viable for solving the old cosmological constant problem. We briefly speculate on a possible way out of this issue.",
    author = "{De Rham}, Claudia and Gregory Gabadadze and Lavinia Heisenberg and David Pirtskhalava",
    year = "2011",
    month = "5",
    day = "11",
    doi = "10.1103/PhysRevD.83.103516",
    language = "English (US)",
    volume = "83",
    journal = "Physical review D: Particles and fields",
    issn = "1550-7998",
    publisher = "American Physical Society",
    number = "10",

    }

    TY - JOUR

    T1 - Cosmic acceleration and the helicity-0 graviton

    AU - De Rham, Claudia

    AU - Gabadadze, Gregory

    AU - Heisenberg, Lavinia

    AU - Pirtskhalava, David

    PY - 2011/5/11

    Y1 - 2011/5/11

    N2 - We explore cosmology in the decoupling limit of a nonlinear covariant extension of Fierz-Pauli massive gravity obtained recently in arXiv:1007.0443. In this limit the theory is a scalar-tensor model of a unique form defined by symmetries. We find that it admits a self-accelerated solution, with the Hubble parameter set by the graviton mass. The negative pressure causing the acceleration is due to a condensate of the helicity-0 component of the massive graviton, and the background evolution, in the approximation used, is indistinguishable from the ΛCDM model. Fluctuations about the self-accelerated background are stable for a certain range of parameters involved. Most surprisingly, the fluctuation of the helicity-0 field above its background decouples from an arbitrary source in the linearized theory. We also show how massive gravity can remarkably screen an arbitrarily large cosmological constant in the decoupling limit, while evading issues with ghosts. The obtained static solution is stable against small perturbations, suggesting that the degravitation of the vacuum energy is possible in the full theory. Interestingly, however, this mechanism postpones the Vainshtein effect to shorter distance scales. Hence, fifth force measurements severely constrain the value of the cosmological constant that can be neutralized, making this scheme phenomenologically not viable for solving the old cosmological constant problem. We briefly speculate on a possible way out of this issue.

    AB - We explore cosmology in the decoupling limit of a nonlinear covariant extension of Fierz-Pauli massive gravity obtained recently in arXiv:1007.0443. In this limit the theory is a scalar-tensor model of a unique form defined by symmetries. We find that it admits a self-accelerated solution, with the Hubble parameter set by the graviton mass. The negative pressure causing the acceleration is due to a condensate of the helicity-0 component of the massive graviton, and the background evolution, in the approximation used, is indistinguishable from the ΛCDM model. Fluctuations about the self-accelerated background are stable for a certain range of parameters involved. Most surprisingly, the fluctuation of the helicity-0 field above its background decouples from an arbitrary source in the linearized theory. We also show how massive gravity can remarkably screen an arbitrarily large cosmological constant in the decoupling limit, while evading issues with ghosts. The obtained static solution is stable against small perturbations, suggesting that the degravitation of the vacuum energy is possible in the full theory. Interestingly, however, this mechanism postpones the Vainshtein effect to shorter distance scales. Hence, fifth force measurements severely constrain the value of the cosmological constant that can be neutralized, making this scheme phenomenologically not viable for solving the old cosmological constant problem. We briefly speculate on a possible way out of this issue.

    UR - http://www.scopus.com/inward/record.url?scp=79957969384&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=79957969384&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevD.83.103516

    DO - 10.1103/PhysRevD.83.103516

    M3 - Article

    VL - 83

    JO - Physical review D: Particles and fields

    JF - Physical review D: Particles and fields

    SN - 1550-7998

    IS - 10

    M1 - 103516

    ER -