Particle Dark Matter

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Several lines of evidence suggest that some of the dark matter may be non-baryonic: the non-detection of various plausible baryonic candidates for dark matter inferred, e.g., from galaxy rotation curves and from cluster of galaxy velocity dispersions, the need for non-baryonic dark matter for theoretical models of galaxy formation, and the large discrepancy between dynamical measurements implying Ω₀ > 0.2 and the baryon abundance inferred from big bang nucleosynthesis, Ωb h² = 0.015. There are a number of well-motivated dark matter candidates: massive neutrinos, supersymmetric dark matter and ``invisible'' axions. Many of these dark matter candidates are potentially detectable by the current generation of dark matter experiments.