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

D’Eramo, Francesco; Profumo, Stefano

doi:10.1103/PhysRevLett.121.071101

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

Journal Article · Fri Aug 17 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.071101· OSTI ID:1464990

D’Eramo, Francesco; Profumo, Stefano

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.

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Research Organization:: Univ. of California, Santa Cruz, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010107

OSTI ID:: 1464990

Alternate ID(s):: OSTI ID: 1498976

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 121 Journal Issue: 7; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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