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Physics Letters B
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.doi:10.1016/s0370-2693(01)01174-1 fatcat:q22uke3fgbd7vesi3qfohyp2fy