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Title: Constraints on Dark Matter Microphysics from the Milky Way Satellite Population

Abstract

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 × 10 –30 cm 2 (10 –27 cm 2) for DM particle masses m χ of 10 keV (10 GeV); these limits scale as m χ 1/4 for m χ << 1 GeV and m χ for m χ >> 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-detectionmore » experiments. Lastly, 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Stanford Univ., Stanford, CA (United States)
  2. Univ. of Southern California, Los Angeles, CA (United States); Princeton Univ., Princeton, NJ (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1530595
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 878; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; cosmology: theory; dark matter; galaxies: halos; methods: numerical

Citation Formats

Nadler, Ethan O., Gluscevic, Vera, Boddy, Kimberly K., and Wechsler, Risa H. Constraints on Dark Matter Microphysics from the Milky Way Satellite Population. United States: N. p., 2019. Web. doi:10.3847/2041-8213/ab1eb2.
Nadler, Ethan O., Gluscevic, Vera, Boddy, Kimberly K., & Wechsler, Risa H. Constraints on Dark Matter Microphysics from the Milky Way Satellite Population. United States. doi:10.3847/2041-8213/ab1eb2.
Nadler, Ethan O., Gluscevic, Vera, Boddy, Kimberly K., and Wechsler, Risa H. Mon . "Constraints on Dark Matter Microphysics from the Milky Way Satellite Population". United States. doi:10.3847/2041-8213/ab1eb2.
@article{osti_1530595,
title = {Constraints on Dark Matter Microphysics from the Milky Way Satellite Population},
author = {Nadler, Ethan O. and Gluscevic, Vera and Boddy, Kimberly K. and Wechsler, Risa H.},
abstractNote = {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 × 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. Lastly, 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.},
doi = {10.3847/2041-8213/ab1eb2},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 878,
place = {United States},
year = {2019},
month = {6}
}

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