skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Consistent scenarios for cosmic-ray excesses from Sommerfeld-enhanced dark matter annihilation

Abstract

Anomalies in direct and indirect detection have motivated models of dark matter consisting of a multiplet of nearly-degenerate states, coupled by a new GeV-scale interaction. We perform a careful analysis of the thermal freezeout of dark matter annihilation in such a scenario. We compute the range of ''boost factors'' arising from Sommerfeld enhancement in the local halo for models which produce the correct relic density, and show the effect of including constraints on the saturated enhancement from the cosmic microwave background (CMB). We find that boost factors from Sommerfeld enhancement of up to ∼ 800 are possible in the local halo. When the CMB bounds on the saturated enhancement are applied, the maximal boost factor is reduced to ∼ 400 for 1–2 TeV dark matter and sub-GeV force carriers, but remains large enough to explain the observed Fermi and PAMELA electronic signals. We describe regions in the DM mass-boost factor plane where the cosmic ray data is well fit for a range of final states, and show that Sommerfeld enhancement alone is enough to provide the large annihilation cross sections required to fit the data, although for light mediator masses (m{sub φ}∼<200 MeV) there is tension with the CMB constraintsmore » in the absence of astrophysical boost factors from substructure. Additionally, we consider the circumstances under which WIMPonium formation is relevant and find for heavy WIMPs (∼>2TeV) and soft-spectrum annihilation channels it can be an important consideration; we find regions with m{sub χ}∼>2.8TeV that are consistent with the CMB bounds with O(600–700) present-day boost factors.« less

Authors:
; ;  [1]; ;  [2]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
  2. Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY 10003 (United States)
Publication Date:
OSTI Identifier:
22277686
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 05; 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; ASTROPHYSICS; COSMIC RADIATION; COSMOLOGY; CROSS SECTIONS; DENSITY; GEV RANGE; LIMITING VALUES; MASS; MEV RANGE; NONLUMINOUS MATTER; RELICT RADIATION; TEV RANGE; WIMPS

Citation Formats

Finkbeiner, Douglas P., Slatyer, Tracy R., Vogelsberger, Mark, Goodenough, Lisa, and Weiner, Neal. Consistent scenarios for cosmic-ray excesses from Sommerfeld-enhanced dark matter annihilation. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/05/002.
Finkbeiner, Douglas P., Slatyer, Tracy R., Vogelsberger, Mark, Goodenough, Lisa, & Weiner, Neal. Consistent scenarios for cosmic-ray excesses from Sommerfeld-enhanced dark matter annihilation. United States. https://doi.org/10.1088/1475-7516/2011/05/002
Finkbeiner, Douglas P., Slatyer, Tracy R., Vogelsberger, Mark, Goodenough, Lisa, and Weiner, Neal. Sun . "Consistent scenarios for cosmic-ray excesses from Sommerfeld-enhanced dark matter annihilation". United States. https://doi.org/10.1088/1475-7516/2011/05/002.
@article{osti_22277686,
title = {Consistent scenarios for cosmic-ray excesses from Sommerfeld-enhanced dark matter annihilation},
author = {Finkbeiner, Douglas P. and Slatyer, Tracy R. and Vogelsberger, Mark and Goodenough, Lisa and Weiner, Neal},
abstractNote = {Anomalies in direct and indirect detection have motivated models of dark matter consisting of a multiplet of nearly-degenerate states, coupled by a new GeV-scale interaction. We perform a careful analysis of the thermal freezeout of dark matter annihilation in such a scenario. We compute the range of ''boost factors'' arising from Sommerfeld enhancement in the local halo for models which produce the correct relic density, and show the effect of including constraints on the saturated enhancement from the cosmic microwave background (CMB). We find that boost factors from Sommerfeld enhancement of up to ∼ 800 are possible in the local halo. When the CMB bounds on the saturated enhancement are applied, the maximal boost factor is reduced to ∼ 400 for 1–2 TeV dark matter and sub-GeV force carriers, but remains large enough to explain the observed Fermi and PAMELA electronic signals. We describe regions in the DM mass-boost factor plane where the cosmic ray data is well fit for a range of final states, and show that Sommerfeld enhancement alone is enough to provide the large annihilation cross sections required to fit the data, although for light mediator masses (m{sub φ}∼<200 MeV) there is tension with the CMB constraints in the absence of astrophysical boost factors from substructure. Additionally, we consider the circumstances under which WIMPonium formation is relevant and find for heavy WIMPs (∼>2TeV) and soft-spectrum annihilation channels it can be an important consideration; we find regions with m{sub χ}∼>2.8TeV that are consistent with the CMB bounds with O(600–700) present-day boost factors.},
doi = {10.1088/1475-7516/2011/05/002},
url = {https://www.osti.gov/biblio/22277686}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 05,
volume = 2011,
place = {United States},
year = {2011},
month = {5}
}