Quintessential adjustment of the cosmological constant
We construct 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.
Hebecker
A
Institut fur Theoretische Physik der Universitat Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany.
Wetterich
C