Interacting dark matter and dark energy

Glennys R. Farrar, P. J E Peebles

    Research output: Contribution to journalArticle

    Abstract

    We discuss models for the cosmological dark sector in which the energy density of a scalar field approximates Einstein's cosmological constant and the scalar field value determines the dark matter particle mass by a Yukawa coupling. A model with one dark matter family can be adjusted so the observational constraints on the cosmological parameters are close to but different from what is predicted by the ΛCDM model. This may be a useful aid to judging how tightly the cosmological parameters are constrained by the new generation of cosmological tests that depend on the theory of structure formation. In a model with two families of dark matter particles the scalar field may be locked to near zero mass for one family. This can suppress the long-range scalar force in the dark sector and eliminate evolution of the effective cosmological constant and the mass of the nonrelativistic dark matter particles, making the model close to ΛCDM, until the particle number density becomes low enough to allow the scalar field to evolve. This is a useful example of the possibility for complexity in the dark sector.

    Original languageEnglish (US)
    Pages (from-to)1-11
    Number of pages11
    JournalAstrophysical Journal
    Volume604
    Issue number1 I
    DOIs
    StatePublished - Mar 20 2004

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    dark energy
    dark matter
    scalars
    sectors
    energy
    particle mass
    flux density
    particle
    family

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Farrar, G. R., & Peebles, P. J. E. (2004). Interacting dark matter and dark energy. Astrophysical Journal, 604(1 I), 1-11. https://doi.org/10.1086/381728

    Interacting dark matter and dark energy. / Farrar, Glennys R.; Peebles, P. J E.

    In: Astrophysical Journal, Vol. 604, No. 1 I, 20.03.2004, p. 1-11.

    Research output: Contribution to journalArticle

    Farrar, GR & Peebles, PJE 2004, 'Interacting dark matter and dark energy', Astrophysical Journal, vol. 604, no. 1 I, pp. 1-11. https://doi.org/10.1086/381728
    Farrar, Glennys R. ; Peebles, P. J E. / Interacting dark matter and dark energy. In: Astrophysical Journal. 2004 ; Vol. 604, No. 1 I. pp. 1-11.
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