Inflationary dynamics with a non-Abelian gauge field

Keiichi Maeda, Kei Yamamoto

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    We study the dynamics of the homogeneous and isotropic universe with a scalar field and an SU(2) non-Abelian gauge (Yang-Mills) field. The scalar field has an exponential potential and the Yang-Mills field is coupled to the scalar field with an exponential function of the scalar field. We find that the magnetic component of the Yang-Mills field assists acceleration of the cosmic expansion and a power-law inflation becomes possible even if the scalar field potential is steep, which may be expected from some compactification of higher-dimensional unified theories of fundamental interactions. This power-law inflationary solution is a stable attractor in a certain range of coupling parameters. Unlike the case with multiple Abelian gauge fields, the power-law inflationary solution with the dominant electric component is unstable because of the existence of nonlinear coupling of the Yang-Mills field. We also analyze the dynamics for the noninflationary regime, and find several attractor solutions.

    Original languageEnglish
    Article number023528
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume87
    Issue number2
    DOIs
    Publication statusPublished - 2013 Jan 28

    Fingerprint

    Yang-Mills fields
    scalars
    exponential functions
    potential fields
    universe
    expansion
    interactions

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Inflationary dynamics with a non-Abelian gauge field. / Maeda, Keiichi; Yamamoto, Kei.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 87, No. 2, 023528, 28.01.2013.

    Research output: Contribution to journalArticle

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