Abstract
The relic abundance and the scalar cross-section off nucleon for light neutralinos (of mass below about 45 GeV) are evaluated in an effective MSSM model with R-parity conservation and without GUT-inspired relations among gaugino masses. It is shown that these neutralinos may provide a sizeable contribution to the matter density in the Universe and produce measurable effects in WIMP direct detection experiments. A lower bound on the neutralino mass m x ≳ 6 GeV, based on the new WMAP data on Ω CDM, is worked out
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