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After reviewing the modified Newtonian dynamics (MOND) proposal, we advocatethat the associated phenomenology may actually not result from a modificationof Newtonian gravity, but from a mechanism of "gravitational polarization" ofsome dipolar medium playing the role of dark matter. We then build arelativistic model within standard general relativity to describe (at somephenomenological level) the dipolar dark matter polarizable in a gravitationalfield. The model naturally involves a cosmological constant, and is shown toreduce to the concordance cosmological scenario (Lambda-CDM) at earlycosmological times. From the mechanism of gravitational polarization, werecover the phenomenology of MOND in a typical galaxy at low redshift.Furthermore, we show that the cosmological constant Lambda scales like a0^2,where a0 is the constant MOND acceleration scale, in good agreement withobservations.

Phenomenology of the Modified Newtonian Dynamics and the Concordance Cosmological Scenario