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A cosmological scenario where axions provide the dark matter in the universe is considered. Fluctuations in the axion-field energy density produced by domain walls and strings cause the appearance of "axion clumps" of masses of order 10^6M_ which most likely collapse to black holes by or at the time that the universe becomes axion dominated at T10 eV. These objects form the building blocks for the clustering hierarchy theory of galaxy and supercluster formation on scales up to 10 Mpc and 10^15M_.
Stecker et al. (Mon,) studied this question.
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