Interacting Quintessence
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We demonstrate that a suitable coupling between a quintessence scalar field and a pressureless cold dark matter (CDM) fluid leads to a constant ratio of the energy densities of both components which is compatible with an accelerated expansion of the Universe.
12 pages, LaTeX; new material on the stability analysis and on the interaction potential added, reference list enlarged and updated; to be published in PLB
12 pages, LaTeX; new material on the stability analysis and on the interaction potential added, reference list enlarged and updated; to be published in PLB