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Cosmological runaway solutions may exhibit an exact dilatation symmetry inthe asymptotic limit of infinite time. In this limit, the massless dilaton orcosmon could be accompanied by another massless scalar field - the geon. Atfinite time, small time-dependent masses for both the cosmon and geon are stillpresent due to imperfect dilatation symmetry. For a sufficiently large mass thegeon will start oscillating and play the role of dark matter, while the cosmonis responsible for dark energy. The common origin of the mass of both fieldsleads to an effective interaction between dark matter and dark energy.Realistic cosmologies are possible for a simple form of the effectivecosmon-geon-potential. We find an inverse geon mass of a size where it couldreduce subgalactic structure formation.

Coupled dark energy and dark matter from dilatation anomaly