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    TH Meeting on Particle Physics Phenomenology

    Quintessential adjustment of the cosmological constant

    by Arthur HEBECKER (CERN-TH)

    → Europe/Zurich
    CERN

    CERN
    Description
    The smallness of the cosmological constant represents one of the most difficult problems in particle physics. In this talk, I describe a time dependent adjustment mechanism for the cosmological 'constant' which could be at work in a late Friedmann-Robertson-Walker universe dominated by quintessence and matter. It makes use of a Brans-Dicke field that couples to the evolving standard-model vacuum energy density. Our explicit model possesses a stable late-time solution with a fixed ratio of matter and field energy densities. No fine tuning of model parameters or initial conditions is required.