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

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

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