The existence of dark matter provides strong evidence for physics beyond the standard model. Extending the standard model with the Peccei–Quinn symmetry and/or supersymmetry, compelling dark-matter candidates appear. For the axion, the neutralino, the gravitino, and the axino, I review primordial production mechanisms, cosmological and astrophysical constraints, experimental searches, and prospects for experimental identification.
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Frank Daniel Steffen (2009) studied this question.
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