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Title: Addressing astrophysical and cosmological problems with secretly asymmetric dark matter

Journal Article · · Physical Review. D.
 [1]; ORCiD logo [2];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of Texas, Austin, TX (United States)
  3. Univ. of Maryland, College Park, MD (United States)

We present a simple model of dark matter that can address astrophysical and cosmological puzzles across a wide range of scales. The model is an application of the secretly asymmetric dark matter mechanism, where several flavors of dark matter are fully asymmetric despite an exact dark matter number symmetry U(1)χ. The dark matter relic abundance arises from these asymmetries, generated in the early Universe through right-handed neutrino decays. The U(1)χ is gauged by a massless dark photon, and asymmetries with opposite signs in the different DM flavors result in the formation of bound states. Dark acoustic oscillations in the early Universe lead to a suppression in the matter power spectrum for addressing the σ8 problem. The dark photon as a relativistic degree of freedom contributes to ΔNeff, easing the tension between the cosmic microwave background and low redshift H0 measurements. Finally, scattering between the bound states after structure formation leads to a flattening of the dark matter distribution at the cores of haloes.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0019225; PHY-1620610; PHY-1607611
OSTI ID:
1543179
Alternate ID(s):
OSTI ID: 1613148
Journal Information:
Physical Review. D., Vol. 100, Issue 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Suppressed flavor violation in lepton flavored dark matter from an extra dimension journal April 2020
Indirect searches for dark matter bound state formation and level transitions text January 2020