New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints
We explore the 511 keV emission associated with sub-GeV dark matter (DM) particles that can produce electron–positron pairs and form positronium after thermalizing. We use ∼16 yr of data from the Spectrometer on INTEGRAL to constrain DM properties, including the full positron propagation and losses,...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Recursos: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/716615 |
| Acesso em linha: | http://hdl.handle.net/10486/716615 https://dx.doi.org/10.3847/2041-8213/ad72f4 |
| Access Level: | acceso abierto |
| Palavra-chave: | Cosmic ray astronomy Particle astrophysics Milky Way dark matter halo Física |
| Resumo: | We explore the 511 keV emission associated with sub-GeV dark matter (DM) particles that can produce electron–positron pairs and form positronium after thermalizing. We use ∼16 yr of data from the Spectrometer on INTEGRAL to constrain DM properties, including the full positron propagation and losses, and the suppression of free electron density away from the Galactic plane. We show that the predicted longitude and latitude profiles vary significantly for different DM masses, unlike previous assumptions, and obtain the strongest limits on sub-GeV DM (from the MeV to a few GeV) so far, excluding cross sections down to 〈σv〉 ≲ 10−32 cm3 s−1 for mχ ∼ 1 MeV and 〈σv〉 ≲ 10−26 cm3 s−1 for mχ ∼ 5 GeV and lifetimes up to τ ≳ 1029 s for mχ ∼ 1 MeV and τ ≳ 1027 s for mχ ∼ 5 GeV for the typical Navarro–Frenk–White DM profile. Our derived limits are robust within a factor of a few due to systematic uncertainties |
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