Hunting the lightest lightest neutralinos

摘要: The lightest neutralino in the minimal supersymmetric extension of standard model can be, principle, massless. If superlight neutralinos are dark matter, structure formation constrains their mass to be above a few keV. I show that relaxing assumption radiation domination and entropy conservation prior big bang nucleosynthesis, relic abundance very light consistent with inferred cold matter density. study how one hunt for at or below GeV, focusing on both direct indirect searches. argue two most promising channels spin-dependent detection search monochromatic gamma rays from prompt pair-annihilation into photons GLAST. My indicates detected as long is tenth range where future linear collider could provide important information details particle model.