Cosmological and astrophysical Vainshtein mechanism in bigravity

Katsuki Aoki, Keiichi Maeda, Makoto Tanabe, Ryo Namba

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

    Abstract

    Although the linear massive spin-2 theory is not restored to general relativity (GR) even in a massless limit, Vainshtein proposed the discontinuity can be resolved by taking into account nonlinear interactions. We consider whether the nonlinear ghost-free bigravity theory can be restored to GR both in the cosmological background and in the strong gravitational field based on a spherically symmetric configuration. In the cosmological background, the scalar graviton is stabilized by nonlinear interactions in the early stage of the Universe, thus the bigravity has the GR limit with neither a ghost instability nor a gradient instability. On the other hand, the bigravity cannot describe a static compact object beyond a critical value of gravitational field strength for a parameter space of coupling constants, at which the scalar graviton shows a singular behaviour.

    Original languageEnglish
    Title of host publication14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
    EditorsRemo Ruffini, Massimo Bianchi, Remo Ruffini, Robert T Jantzen
    PublisherWorld Scientific Publishing Co. Pte Ltd
    Pages1493-1498
    Number of pages6
    ISBN (Electronic)9789813226593
    Publication statusPublished - 2018 Jan 1
    Event14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy
    Duration: 2015 Jul 122015 Jul 18

    Other

    Other14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
    CountryItaly
    CityRome
    Period15/7/1215/7/18

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    Keywords

    • Modified gravity
    • Screening mechanism

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Astronomy and Astrophysics

    Cite this

    Aoki, K., Maeda, K., Tanabe, M., & Namba, R. (2018). Cosmological and astrophysical Vainshtein mechanism in bigravity. In R. Ruffini, M. Bianchi, R. Ruffini, & R. T. Jantzen (Eds.), 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings (pp. 1493-1498). World Scientific Publishing Co. Pte Ltd.