2025/02/17 by Benito, María, Hütsi, Gert, Müürsepp, Kristjan +4 · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2502.12030
Ultrafaint dwarf galaxies (UFDs) are ideal for studying dark matter (DM) due to minimal baryonic effects. UFD observations suggest cored DM profiles. We find that the core radius -- stellar mass scaling predicted by fuzzy dark matter (FDM) is at 6.1σ tension with UFD observations. Combining observations from 27 UFDs, the required FDM mass ma = 3.2-0.6+0.8× 10-21 \rm eV is also in conflict with existing Lyman-α bounds. Our results suggest that FDM cannot provide a consistent explanation for DM cores and imply ma > 2.2× 10-21 \rm eV at to 2σ CL.