$J$ -factors for velocity-dependent dark matter annihilation

Journal Article · Fri Jul 22 00:00:00 EDT 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.106.023025· OSTI ID:1877442

Boucher, Bradly; Kumar, Jason; Le, Van B.; Runburg, Jack

If dark matter annihilates with a velocity-dependent cross section within a subhalo, then the magnitude and angular distribution of the resulting photon signal will change. These effects are encoded in the J-factor. In this work we compute the J-factor for a variety of choices for the cross section velocity dependence, and for a variety of choices for the dark matter profile, including generalized Navarro-Frenk-White, Einasto, Burkert and Moore. Interestingly, we find that for a density profile with an inner slope power law steeper than 4/3, Sommerfeld-enhanced annihilation in the Coulomb limit leads to a divergence at the center, requiring a more detailed treatment of departure from the Coulomb limit.

• Research Organization: Univ. of Hawaii, Honolulu, HI (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); University of Hawaii
• Grant/Contract Number: SC0010504; AST-1934744
• OSTI ID: 1877442
• Alternate ID(s): OSTI ID: 1980142
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 106 Journal Issue: 2; ISSN 2470-0010
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
particle astrophysics
particle dark matter