Résumé
If R-parity is sufficiently well conserved, most of the supersymmetric models predict the existence of a stable, neutral particle, the neutralino, which would be a natural candidate for dark matter. Such particles can annihilate through various channels producing in particular, a faint flux of high energy photons in galactic and extragalactic high density regions. We have considered the potential of a Cerenkov array for exploring a significant fraction of the supersymmetric parameter space. The main constraints are the flux limit, which requires a very large effective area, and the energy threshold which needs reaching lower limit of the order of 15-20 GeV due to the lowest neutralino mass given by accelerators. Combining such constaints leads to an array of at least 1619 Cerenkov reflectors with diameters of the order of 18m, located at high altitude (5000 m). This instrument would combine wide angle camera and large detection areas. It would also serve as a major tool in Observational Cosmology and Astrophysics above 15-20 GeV up to 1 TeV. Corning after GLAST, it would allow studying in details, at higher energy, the sources detected by this satellite. This instrument would not be able to explore the 10 GeV to sub-10 GeV domain unless higher QE detectors are discovered or larger diameters are considered. A very interesting site would be the Chajnantor-Toco area for this project which requires clear UBV photometric nights.