Dark matter decay signals in cosmic filaments

Fuente: arXiv
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Main Authors: Pinetti, Elena, Vienneau, Evan, Bozorgnia, Nassim
Format: Preprint
Published: 2025
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author Pinetti, Elena
Vienneau, Evan
Bozorgnia, Nassim
author_facet Pinetti, Elena
Vienneau, Evan
Bozorgnia, Nassim
contents 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.
format Preprint
id arxiv_https___arxiv_org_abs_2504_08025
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Dark matter decay signals in cosmic filaments
Pinetti, Elena
Vienneau, Evan
Bozorgnia, Nassim
Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
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.
title Dark matter decay signals in cosmic filaments
topic Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
url https://arxiv.org/abs/2504.08025