Sommerfeld enhancement of invisible dark matter annihilation in galaxies and galaxy clusters

Research output: Contribution to journalArticle

Abstract

Recent observations indicate that core-like dark matter structures exist in many galaxies, while numerical simulations reveal a singular dark matter density profile at the center. In this article, I show that if the annihilation of dark matter particles gives invisible sterile neutrinos, the Sommerfeld enhancement of the annihilation cross-section can give a sufficiently large annihilation rate to solve the core-cusp problem. The resultant core density, core radius, and their scaling relation generally agree with recent empirical fits from observations. Also, this model predicts that the resultant core-like structures in dwarf galaxies can be easily observed, but not for large normal galaxies and galaxy clusters. Copyright © 2016 Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)1-7
JournalAstroparticle Physics
Volume80
Early online dateMar 2016
DOIs
Publication statusPublished - Jul 2016

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dark matter
galaxies
augmentation
dwarf galaxies
cusps
neutrinos
scaling
radii
cross sections
profiles
simulation

Citation

Chan, M. H. (2016). Sommerfeld enhancement of invisible dark matter annihilation in galaxies and galaxy clusters. Astroparticle Physics, 80, 1-7.

Keywords

  • Dark Matter