INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B-L$ and $L_{i}-L_{j}$ Vectors

Thong T. Q. Nguyen; Pedro De la Torre Luque; Isabelle John; Shyam Balaji; Pierluca Carenza; Tim Linden

doi:10.1103/fn6k-1nlc

paper

INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B - L$ and $L_{i} - L_{j}$ Vectors

arXiv:2507.13432 · doi:10.1103/fn6k-1nlc

Abstract

The decay of light bosonic dark matter particles can produce a bright electron/positron ( $e^{+} e^{-}$ ) flux that can be strongly constrained by local Voyager observations of the direct $e^{+} e^{-}$ flux, as well as 511 keV Line and X-ray continuum observations of $e^{+} e^{-}$ emission. We carefully analyze the $e^{+} e^{-}$ yield and resulting cosmic-ray and X-ray spectra from theoretically well-motivated light dark matter models, including: (a) electrophilic axion-like particles, (b) dark photons, (c) scalars, and (d) $B - L$ and $L_{i} - L_{j}$ vector bosons. We use the morphology and spectrum of the INTEGRAL 511 keV line data, the eROSITA X-ray continuum spectrum and the Voyager $e^{+} e^{-}$ spectrum to constrain the decay lifetime and coupling of each dark matter model. We find that 511 keV observations typically set world-leading limits on bosonic dark matter decay below masses of $\sim$ 1 GeV, while eROSITA observations provide the strongest constraints in the range from 1--10 GeV. Finally, we forecast future limits from 21 cm line searches with next-generation HERA data.

17 pages, 10 figures. Published version on PRD

INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, B−L and Li​−Lj​ Vectors

Abstract

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INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B - L$ and $L_{i} - L_{j}$ Vectors