Light photinos as dark matter

Glennys R. Farrar, Edward W. Kolb

    Research output: Contribution to journalArticle

    Abstract

    There are good reasons to consider models of low-energy supersymmetry with very light photinos and gluinos. In most of these models the lightest R-odd, color-singlet state containing a gluino, the R0, has a mass in the 1-2 GeV range and the slightly lighter photino γ̃ would survive as the relic R-odd species. For the light photino masses considered here, previous calculations resulted in an unacceptable photino relic abundance. But we point out that processes other than photino self-annihilation determine the relic abundance when the photino and R0 are close in mass. Including R0↔γ̃ processes, we find that the photino relic abundance is most sensitive to the R0-to-γ̃ mass ratio, and within model uncertainties, a critical density in photinos may be obtained for an R0-to-γ̃ mass ratio in the range 1.2 to 2.2. We propose photinos in the mass range of 500 MeV to 1.6 GeV as a dark matter candidate, and discuss a strategy to test the hypothesis.

    Original languageEnglish (US)
    Pages (from-to)2990-3001
    Number of pages12
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume53
    Issue number6
    StatePublished - Mar 15 1996

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    Dark Matter
    dark matter
    mass ratios
    Odd
    Range of data
    supersymmetry
    Model Uncertainty
    Annihilation
    Supersymmetry
    color
    Energy
    Model
    energy

    ASJC Scopus subject areas

    • Mathematical Physics
    • Physics and Astronomy(all)
    • Physics and Astronomy (miscellaneous)
    • Nuclear and High Energy Physics

    Cite this

    Light photinos as dark matter. / Farrar, Glennys R.; Kolb, Edward W.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 53, No. 6, 15.03.1996, p. 2990-3001.

    Research output: Contribution to journalArticle

    Farrar, GR & Kolb, EW 1996, 'Light photinos as dark matter', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 53, no. 6, pp. 2990-3001.
    Farrar, Glennys R. ; Kolb, Edward W. / Light photinos as dark matter. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 1996 ; Vol. 53, No. 6. pp. 2990-3001.
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