Ultralight scalars and spiral galaxies

Gia Dvali, Gregory Gabadadze, M. Shifman

    Research output: Contribution to journalArticle

    Abstract

    We study some possible astrophysical implications of a very weakly coupled ultralight dilaton-type scalar field. Such a field may develop an (approximately stable) network of domain walls. The domain wall thickness is assumed to be comparable with the thickness of the luminous part of the spiral galaxies. The walls provide trapping for galactic matter. This is used to motivate the very existence of the spiral galaxies. A zero-mode existing on the domain wall is a massless scalar particle confined to (1 + 2) dimensions. At distances much larger than the galaxy/wall thickness, the zero-mode exchange generates a logarithmic potential, acting as an additional term with respect to Newton's gravity. The logarithmic term naturally leads to constant rotational velocities at the periphery. We estimate the scalar field coupling to the matter energy-momentum tensor needed to fit the observable flat rotational curves of the spiral galaxies. The value of this coupling turns out to be reasonable - we find no contradiction with the existing data.

    Original languageEnglish (US)
    Pages (from-to)513-530
    Number of pages18
    JournalModern Physics Letters A
    Volume16
    Issue number8
    DOIs
    StatePublished - Mar 14 2001

    Fingerprint

    Galaxies
    spiral galaxies
    domain wall
    Domain Wall
    Scalar
    scalars
    galaxies
    Scalar Field
    Logarithmic Potential
    newton
    Energy-momentum Tensor
    Dilaton
    astrophysics
    Zero
    Term
    kinetic energy
    Trapping
    trapping
    tensors
    gravitation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Statistical and Nonlinear Physics
    • Mathematical Physics
    • Nuclear and High Energy Physics

    Cite this

    Ultralight scalars and spiral galaxies. / Dvali, Gia; Gabadadze, Gregory; Shifman, M.

    In: Modern Physics Letters A, Vol. 16, No. 8, 14.03.2001, p. 513-530.

    Research output: Contribution to journalArticle

    Dvali, G, Gabadadze, G & Shifman, M 2001, 'Ultralight scalars and spiral galaxies', Modern Physics Letters A, vol. 16, no. 8, pp. 513-530. https://doi.org/10.1142/S0217732301003206
    Dvali, Gia ; Gabadadze, Gregory ; Shifman, M. / Ultralight scalars and spiral galaxies. In: Modern Physics Letters A. 2001 ; Vol. 16, No. 8. pp. 513-530.
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