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New constraints on isospin-violating dark matter

Jason Kumar, David Sanford, and Louis E. Strigari
Phys. Rev. D 85, 081301(R) – Published 9 April 2012

Abstract

We derive bounds on the dark matter annihilation cross-section for low-mass (5–20 GeV) dark matter annihilating primarily to up or down quarks, using the Fermi-LAT bound on gamma-rays from Milky Way satellites. For models in which dark matter-Standard Model interactions are mediated by particular contact operators, we show that these bounds can be directly translated into bounds on the dark matter-proton scattering cross section. For isospin-violating dark matter, these constraints are tight enough to begin to constrain the parameter-space consistent with experimental signals of low-mass dark matter. We discuss possible models that can evade these bounds.

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  • Figure
  • Received 9 January 2012

DOI:https://doi.org/10.1103/PhysRevD.85.081301

© 2012 American Physical Society

Authors & Affiliations

Jason Kumar1, David Sanford2, and Louis E. Strigari3

  • 1Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
  • 2Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
  • 3Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305 USA

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Issue

Vol. 85, Iss. 8 — 15 April 2012

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