Strong Constraints on Line Signals from Dark Matter Annihilation in a Nearby Subhalo

arXiv:2609.03016 · hep-ph, astro-ph.HE · Submitted 2026-09-02 · Read on arXiv

hep-ph, astro-ph.HE

Submitted: 2026-09-02

Updated: 2026-09-04

Code: https://github.com/usnistgov/FCpy

Terminology

• Galactic Center — 27× in this paper
• Higgs Portal — 19× in this paper
• Benchmark — 9× in this paper · explained in 2 episodes
• Abundance — 7× in this paper · explained in 1 episode
• Galactic Center Excess — 5× in this paper
• Robustness — 2× in this paper · explained in 5 episodes
• Test Statistic — 2× in this paper
• Trace — 2× in this paper · explained in 2 episodes
• Core — 1× in this paper · explained in 2 episodes
• N-body simulations — 1× in this paper · explained in 2 episodes
• Symmetry Breaking — 1× in this paper · explained in 3 episodes

Sources

• Dark Matter
• Particle Dark Matter: Evidence, Candidates and Constraints
• A direct empirical proof of the existence of dark matter
• Planck 2018 results. VI. Cosmological parameters
• Supersymmetric Dark Matter
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
• Updated Search for Spectral Lines from Galactic Dark Matter Interactions with Pass 8 Data from the Fermi Large Area Telescope
• Gamma-Ray Lines in 15 Years of Fermi-LAT Data: New Constraints on Higgs Portal Dark Matter
• The Structure of Cold Dark Matter Halos
• Legacy Analysis of Dark Matter Annihilation from the Milky Way Dwarf Spheroidal Galaxies with 14 Years of Fermi-LAT Data
• An evidence for indirect detection of dark matter from galaxy clusters in Fermi-LAT data
• Search for Gamma-ray Spectral Lines with the Fermi Large Area Telescope and Dark Matter Implications
• Search for Gamma-Ray Lines towards Galaxy Clusters with the Fermi-LAT
• Search for a gamma-ray line feature from a group of nearby Galaxy clusters with Fermi LAT Pass 8 data
• Search for $\gamma$-ray line signals from dark matter annihilations in the inner Galactic halo from ten years of observations with H.E.S.S
• Search for Gamma-ray Spectral Lines from Dark Matter Annihilation up to 100 TeV towards the Galactic Center with MAGIC
• Evidence for a $\sim 43$ GeV $\gamma$-ray line signal in a stacking analysis of the Virgo, Fornax, and Ophiuchus Galaxy clusters
• Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications

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• Axions as Dark Matter, Dark Energy, and Dark Radiation