Accelerating universes in string theory via field redefinition

Keiichi Maeda, Nobuyoshi Ohta, Ryo Wakebe

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field redefinition and we analyze generalized effective theories due to this ambiguity. We restrict our analysis to the effective theories which give equations of motion of second order in the derivatives, just as "Galileon" field theory. This class of effective actions contains two free coupling constants. We find de Sitter solutions as well as the power-law expanding universes in our four-dimensional Einstein frame. The accelerated expanding universes are always attractors in the present dynamical system.

    Original languageEnglish
    Pages (from-to)1-18
    Number of pages18
    JournalEuropean Physical Journal C
    Volume72
    Issue number3
    DOIs
    Publication statusPublished - 2012 Mar

    Fingerprint

    String theory
    string theory
    ambiguity
    universe
    dynamical systems
    Equations of motion
    Dynamical systems
    equations of motion
    strings
    Derivatives

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)
    • Engineering (miscellaneous)

    Cite this

    Accelerating universes in string theory via field redefinition. / Maeda, Keiichi; Ohta, Nobuyoshi; Wakebe, Ryo.

    In: European Physical Journal C, Vol. 72, No. 3, 03.2012, p. 1-18.

    Research output: Contribution to journalArticle

    Maeda, Keiichi ; Ohta, Nobuyoshi ; Wakebe, Ryo. / Accelerating universes in string theory via field redefinition. In: European Physical Journal C. 2012 ; Vol. 72, No. 3. pp. 1-18.
    @article{3c5212464e37487fa30de86af39aae2a,
    title = "Accelerating universes in string theory via field redefinition",
    abstract = "We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field redefinition and we analyze generalized effective theories due to this ambiguity. We restrict our analysis to the effective theories which give equations of motion of second order in the derivatives, just as {"}Galileon{"} field theory. This class of effective actions contains two free coupling constants. We find de Sitter solutions as well as the power-law expanding universes in our four-dimensional Einstein frame. The accelerated expanding universes are always attractors in the present dynamical system.",
    author = "Keiichi Maeda and Nobuyoshi Ohta and Ryo Wakebe",
    year = "2012",
    month = "3",
    doi = "10.1140/epjc/s10052-012-1949-6",
    language = "English",
    volume = "72",
    pages = "1--18",
    journal = "European Physical Journal C",
    issn = "1434-6044",
    publisher = "Springer New York",
    number = "3",

    }

    TY - JOUR

    T1 - Accelerating universes in string theory via field redefinition

    AU - Maeda, Keiichi

    AU - Ohta, Nobuyoshi

    AU - Wakebe, Ryo

    PY - 2012/3

    Y1 - 2012/3

    N2 - We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field redefinition and we analyze generalized effective theories due to this ambiguity. We restrict our analysis to the effective theories which give equations of motion of second order in the derivatives, just as "Galileon" field theory. This class of effective actions contains two free coupling constants. We find de Sitter solutions as well as the power-law expanding universes in our four-dimensional Einstein frame. The accelerated expanding universes are always attractors in the present dynamical system.

    AB - We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field redefinition and we analyze generalized effective theories due to this ambiguity. We restrict our analysis to the effective theories which give equations of motion of second order in the derivatives, just as "Galileon" field theory. This class of effective actions contains two free coupling constants. We find de Sitter solutions as well as the power-law expanding universes in our four-dimensional Einstein frame. The accelerated expanding universes are always attractors in the present dynamical system.

    UR - http://www.scopus.com/inward/record.url?scp=84858723958&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84858723958&partnerID=8YFLogxK

    U2 - 10.1140/epjc/s10052-012-1949-6

    DO - 10.1140/epjc/s10052-012-1949-6

    M3 - Article

    AN - SCOPUS:84858723958

    VL - 72

    SP - 1

    EP - 18

    JO - European Physical Journal C

    JF - European Physical Journal C

    SN - 1434-6044

    IS - 3

    ER -