Dark matter decay signals in cosmic filaments

2025/04/10 by Elena Pinetti, Pinetti, Elena, Evan Vienneau +3 · 1 voice
Physics and Astronomy · #Atomic and Subatomic Physics Research #COSMIC cancer database #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Hot dark matter #Light dark matter #Protein filament #Scalar field dark matter #Synchrotron #astro-ph.CO #hep-ph

paper · pdf · doi:10.48550/arxiv.2504.08025

openalex publication_date 2025/04/10 · arxiv published 2025/04/10 · arxiv updated 2025/04/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Cosmic filaments form the backbone of the cosmic web, yet their properties and evolution remain uncertain. Using the EAGLE hydrodynamical simulations, we investigate the dark matter density profiles in filaments and their implications for dark matter decay signals. We show that GeV-scale dark matter particles decaying into electron-positron pairs can produce detectable radio synchrotron emission. By leveraging stacked filament radio data, we place stringent constraints on the dark matter decay lifetime, improving existing limits by up to two orders of magnitude for strong filamentary magnetic fields.

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Discussions

• Filaments thread the cosmos together, yet their properties remain a mystery. Here, I investigate dark matter signals within these cosmic bridges: arxiv.org/abs/2504.08025 @simonsfoundation.org @flatir [bsky, 0 points, 0 comments]

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