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Title: Sub-GeV Dark Matter Shining at Future MeV γ -Ray Telescopes

Abstract

We propose a novel framework where light (sub-GeV) dark matter (DM) is detectable with future MeV γ -ray telescopes without conflicting with cosmic microwave background (CMB) data. The stable DM particle χ has a very low thermal relic abundance due to its large pair-annihilation cross section. The DM number density is stored in a slightly heavier, metastable partner ψ with suppressed pair-annihilation rates, that does not perturb the CMB, and whose late-time decays ψ → χ fill the Universe with χ DM particles. We provide explicit, model-independent realizations for this framework, and discuss constraints on late-time decays, and thus on parameters of this setup, from CMB, big bang nucleosynthesis, and large scale structure.

Authors:
;
Publication Date:
Research Org.:
Univ. of California, Santa Cruz, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1464990
Alternate Identifier(s):
OSTI ID: 1498976
Grant/Contract Number:  
[SC0010107]
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
[Journal Name: Physical Review Letters Journal Volume: 121 Journal Issue: 7]; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

D’Eramo, Francesco, and Profumo, Stefano. Sub-GeV Dark Matter Shining at Future MeV γ -Ray Telescopes. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.071101.
D’Eramo, Francesco, & Profumo, Stefano. Sub-GeV Dark Matter Shining at Future MeV γ -Ray Telescopes. United States. doi:10.1103/PhysRevLett.121.071101.
D’Eramo, Francesco, and Profumo, Stefano. Fri . "Sub-GeV Dark Matter Shining at Future MeV γ -Ray Telescopes". United States. doi:10.1103/PhysRevLett.121.071101.
@article{osti_1464990,
title = {Sub-GeV Dark Matter Shining at Future MeV γ -Ray Telescopes},
author = {D’Eramo, Francesco and Profumo, Stefano},
abstractNote = {We propose a novel framework where light (sub-GeV) dark matter (DM) is detectable with future MeV γ -ray telescopes without conflicting with cosmic microwave background (CMB) data. The stable DM particle χ has a very low thermal relic abundance due to its large pair-annihilation cross section. The DM number density is stored in a slightly heavier, metastable partner ψ with suppressed pair-annihilation rates, that does not perturb the CMB, and whose late-time decays ψ → χ fill the Universe with χ DM particles. We provide explicit, model-independent realizations for this framework, and discuss constraints on late-time decays, and thus on parameters of this setup, from CMB, big bang nucleosynthesis, and large scale structure.},
doi = {10.1103/PhysRevLett.121.071101},
journal = {Physical Review Letters},
number = [7],
volume = [121],
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevLett.121.071101

Citation Metrics:
Cited by: 2 works
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Figures / Tables:

FIG. 1. FIG. 1. : Allowed parameter space for $ψ$ nonthermal production. For different values of $r$σ (see main text), we shade regions excluded by overproduction and/or CMB bounds. The region below each curve is excluded. We also show current diffuse limits for $χχ$ → $e$+$e$.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.