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Title: Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky

Abstract

We consider the process of scattering of Galactic cosmic-ray electrons and protons off of dark matter with the radiation of a final-state photon. This process provides a novel way to search for Galactic dark matter with gamma rays. We argue that for a generic weakly interacting massive particle, barring effects such as co-annihilation or a velocity-dependent cross section, the gamma-ray emission from cosmic-ray scattering off of dark matter is typically smaller than that from dark matter pair-annihilation. However, if dark matter particles cannot pair-annihilate, as is the case for example in asymmetric dark matter scenarios, cosmic-ray scattering with final state photon emission provides a unique window to detect a signal from dark matter with gamma rays. We estimate the expected flux level and its spectral features for a generic supersymmetric setup, and we also discuss dipolar and luminous dark matter. We show that in some cases the gamma-ray emission might be large enough to be detectable with the Fermi Large Area Telescope.

Authors:
;  [1]
  1. Department of Physics, University of California, 1156 High St., Santa Cruz, CA 95064 (United States)
Publication Date:
OSTI Identifier:
22277810
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASYMMETRY; COSMIC ELECTRONS; COSMIC PHOTONS; COSMIC PROTONS; CROSS SECTIONS; GAMMA DETECTION; GAMMA RADIATION; NONLUMINOUS MATTER; PHOTON EMISSION; SCATTERING; SUPERSYMMETRY; TELESCOPE COUNTERS; VELOCITY; WIMPS

Citation Formats

Profumo, Stefano, and Ubaldi, Lorenzo. Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/08/020.
Profumo, Stefano, & Ubaldi, Lorenzo. Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky. United States. https://doi.org/10.1088/1475-7516/2011/08/020
Profumo, Stefano, and Ubaldi, Lorenzo. Mon . "Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky". United States. https://doi.org/10.1088/1475-7516/2011/08/020.
@article{osti_22277810,
title = {Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky},
author = {Profumo, Stefano and Ubaldi, Lorenzo},
abstractNote = {We consider the process of scattering of Galactic cosmic-ray electrons and protons off of dark matter with the radiation of a final-state photon. This process provides a novel way to search for Galactic dark matter with gamma rays. We argue that for a generic weakly interacting massive particle, barring effects such as co-annihilation or a velocity-dependent cross section, the gamma-ray emission from cosmic-ray scattering off of dark matter is typically smaller than that from dark matter pair-annihilation. However, if dark matter particles cannot pair-annihilate, as is the case for example in asymmetric dark matter scenarios, cosmic-ray scattering with final state photon emission provides a unique window to detect a signal from dark matter with gamma rays. We estimate the expected flux level and its spectral features for a generic supersymmetric setup, and we also discuss dipolar and luminous dark matter. We show that in some cases the gamma-ray emission might be large enough to be detectable with the Fermi Large Area Telescope.},
doi = {10.1088/1475-7516/2011/08/020},
url = {https://www.osti.gov/biblio/22277810}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 08,
volume = 2011,
place = {United States},
year = {2011},
month = {8}
}