2019ApJ...878L..32N -
Astrophys. J., 878, L32-L32 (2019/June-3)
Constraints on dark matter microphysics from the Milky Way satellite population.
NADLER E.O., GLUSCEVIC V., BODDY K.K. and WECHSLER R.H.
Abstract (from CDS):
Alternatives to the cold, collisionless dark matter (DM) paradigm in which DM behaves as a collisional fluid generically suppress small-scale structure. Herein we use the observed population of Milky Way (MW) satellite galaxies to constrain the collisional nature of DM, focusing on DM-baryon scattering. We first derive conservative analytic upper limits on the velocity-independent DM-baryon scattering cross section by translating the upper bound on the lowest mass of halos inferred to host satellites into a characteristic cutoff scale in the linear matter power spectrum. We then confirm and improve these results through a detailed probabilistic inference of the MW satellite population that marginalizes over relevant astrophysical uncertainties. This yields 95% confidence upper limits on the DM-baryon scattering cross section of 6 x 10–30 cm2 (10–27 cm2) for DM particle masses mχ of 10 keV (10 GeV); these limits scale as mχ1/4 for mχ ≪ 1 GeV and mχ for mχ ≫ 1 GeV. This analysis improves upon cosmological bounds derived from cosmic-microwave-background anisotropy measurements by more than three orders of magnitude over a wide range of DM masses, excluding regions of parameter space previously unexplored by other methods, including direct-detection experiments. Our work reveals a mapping between DM-baryon scattering and other alternative DM models, and we discuss the implications of our results for warm and fuzzy DM scenarios.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
cosmology: theory - dark matter - galaxies: halos - methods: numerical
Errata:
erratum vol. 897, art. L46 (2020)
Simbad objects:
1
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