#7
Fuzzy Dark Matter (Ultralight Axions)
Fuzzy Dark Matter's ultralight axions, with masses around 10⁻²² eV, have de Broglie wavelengths spanning entire galaxies, suppressing small-scale structure and explaining the dwarf galaxy deficit versus cold dark matter. Yet Lyman-alpha forest data from Keck Observatory tightens constraints, pushing the axion mass above 2 × 10⁻²¹ eV.
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