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Annihilation vs. Decay: Constraining Dark Matter Properties from a Gamma-Ray Detection in Dwarf Galaxies
Cosmology and Nongalactic Astrophysics · Submitted 10 Dec 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that by studying the dependence of the intensity and energy spectrum on the angular distribution of the signal, the origin of the signal could be identified, and some information about the presence of substructure might be extracted.
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The abstract, sentence by sentence
Although most proposed dark matter candidates are stable, in order for dark matter to be present today, the only requirement is that its lifetime is longer than the age of the Universe, t_U ~ 4 10^17 s. Moreover, the dark matter particle could be produced via non-thermal processes and have a larger annihilation cross section from the canonical value for thermal dark matter, <sigma v> ~ 3 10^{-26} cm3/s. We propose a strategy to distinguish between dark matter annihilation and/or decay in the case that a clear signal is detected in future gamma-ray observations of Milky Way dwarf galaxies with gamma-ray experiments. The discrimination between these cases would not be possible in the case of the measurement of only the energy spectrum. We show that by studying the dependence of the intensity and energy spectrum on the angular distribution of the signal, the origin of the signal could be identified, and some information about the presence of substructure might be extracted.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Although most proposed dark matter candidates are stable, in order for dark matter to be present today, the only requirement is that its lifetime is longer than the age of the Universe, t_U ~ 4 10^17 s. | background 1.00 | 0.06 | 0.03 | asserted 0.99 |
| s1 | Moreover, the dark matter particle could be produced via non-thermal processes and have a larger annihilation cross section from the canonical value for thermal dark matter, <sigma v> ~ 3 10^{-26} cm3/s. | background 1.00 | 0.06 | 0.03 | hedged possibility 1.00 |
| s2 | We propose a strategy to distinguish between dark matter annihilation and/or decay in the case that a clear signal is detected in future gamma-ray observations of Milky Way dwarf galaxies with gamma-ray experiments. | contribution 0.94 | 0.55 | 0.20 | asserted 0.51 |
| s3 | The discrimination between these cases would not be possible in the case of the measurement of only the energy spectrum. | limitation 0.52 | 0.29 | 0.12 | asserted 0.82 |
| s4 | We show that by studying the dependence of the intensity and energy spectrum on the angular distribution of the signal, the origin of the signal could be identified, and some information about the presence of substructure might be extracted. | contribution 0.41 | 0.82 | 0.80 | hedged possibility 0.80 |
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The paper
Original abstract
Although most proposed dark matter candidates are stable, in order for dark matter to be present today, the only requirement is that its lifetime is longer than the age of the Universe, t_U ~ 4 10^17 s. Moreover, the dark matter particle could be produced via non-thermal processes and have a larger annihilation cross section from the canonical value for thermal dark matter, <sigma v> ~ 3 10^{-26} cm3/s. We propose a strategy to distinguish between dark matter annihilation and/or decay in the case that a clear signal is detected in future gamma-ray observations of Milky Way dwarf galaxies with gamma-ray experiments. The discrimination between these cases would not be possible in the case of the measurement of only the energy spectrum. We show that by studying the dependence of the intensity and energy spectrum on the angular distribution of the signal, the origin of the signal could be identified, and some information about the presence of substructure might be extracted.
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How the literature uses it
5 arXiv papers cite this in 9 sentences
Papers whose main result relates to this one's
States the same result 1 paper
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We show that by examining the dependence of the intensity and energy spectrum on the angular distribution of the emission, the origin could be identified as decay, annihilation, or both.
Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection · 0.94
Papers citing it · 2 sentences without a confident label
Cites it as background 3 papers
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Different approaches have been proposed to determine the DM properties by using indirect or direct measurements or their combination [ref] .
Constraining Dark Matter Properties with Gamma-Rays from the Galactic Center with Fermi-LAT · Introduction · 0.87
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Finally, more exotic explanations call for new astronomical and/or particle physics phenomena, such as dark matter [ref] .
Extracting the size of the cosmic electron-positron anomaly · What is the source of the anomaly? · 0.93
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Indeed, several approaches have been proposed to determine DM particle properties by using future indirect WIMP DM-induced signals of gamma-rays or neutrinos, direct detection searches, collider information or their combination [ref] .
Constraining the Milky Way Dark Matter Density Profile with Gamma-Rays with Fermi-LAT · Conclusions · 0.87
What it cites · 7 sentences without a confident label
Uses the method or tool of 1 paper
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We describe the mass distribution of the smooth DM halo of each dwarf galaxy by a Navarro, Frenk and White (NFW) density profile [ref] and the collective emission from subhalos within the dwarf galaxy halo, by summing over the contribution to the gamma-ray signal from subhalos of all masses.
Simulations of X-ray Clusters · General Idea · 0.92
Cites as support 2 papers
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As pointed out in Refs. [ref] , angular information is crucial to distinguish DM annihilation from decay.
Gamma-Rays from Decaying Dark Matter · General Idea · 0.98
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As pointed out in Refs. [ref] , angular information is crucial to distinguish DM annihilation from decay.
Model-Independent Bound on the Dark Matter Lifetime · General Idea · 0.98
Cites as background 3 papers
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During the last years, different approaches have been proposed to constrain dark matter properties by using indirect measurements [ref] .
Extracting the Gamma Ray Signal from Dark Matter Annihilation in the Galactic Center Region · Introduction · 0.99
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During the last years, different approaches have been proposed to constrain dark matter properties by using indirect measurements [ref] .
The detectability of dark matter annihilation with Fermi using the anisotropy energy spectrum of the gamma-ray background · Introduction · 0.99
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During the last years, different approaches have been proposed to constrain dark matter properties by using indirect measurements [ref] .
WIMP Mass Determination with Neutrino Telescopes · Introduction · 0.99
Discussion
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