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3D mapping of matter distribution in the universe through the 21 cm radioemission of atomic hydrogen is a complementary approach to optical surveys forthe study of the Large Scale Structures, in particular for measuring the BAO(Baryon Acoustic Oscillation) scale up to redshifts z <~ 3 and constrain darkenergy. We propose to carry such a survey through a novel method, calledintensity mapping, without detecting individual galaxies radio emission. Thismethod requires a wide band instrument, 100 MHz or larger, and multiple beams,while a rather modest angular resolution of 10 arcmin would be sufficient. Theinstrument would have a few thousand square meters of collecting area and fewhundreds of simultaneous beams. These constraints could be fulfilled with adense array of receivers in interferometric mode, or a phased array at thefocal plane of a large antenna.

BAORadio : Cartographie 3D de la distribution de gaz H$_I$ dans l'Univers