Dark matter self-interactions and light force carriers

Matthew R. Buckley and Patrick J. Fox
Phys. Rev. D 81, 083522 – Published 19 April 2010

Abstract

Recent observations from PAMELA, FERMI, and ATIC point to a new source of high energy cosmic rays. If these signals are due to annihilating dark matter (DM), the annihilation cross section in the present day must be substantially larger than that necessary for thermal freeze-out in the early universe. A new force, mediated by a particle of mass O(100MeV), leading to a velocity-dependent annihilation cross section—a “Sommerfeld enhancement”—has been proposed as a possible explanation. We point out that such models necessarily increase the DM self-scattering cross section, and use observational bounds on the amount of DM-DM scattering allowed in various astrophysical systems to place constraints on the mass and couplings of the light mediator.

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  • Received 11 February 2010

DOI:https://doi.org/10.1103/PhysRevD.81.083522

©2010 American Physical Society

Authors & Affiliations

Matthew R. Buckley1 and Patrick J. Fox2

  • 1Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
  • 2Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA

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Issue

Vol. 81, Iss. 8 — 15 April 2010

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