8legs: University of tokyo

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Did we just see dark matter? Scientists express skepticism

New analysis of 15 years of Fermi data finds a gamma-ray halo near the Milky Way's center that could signal dark matter.
Experts note the claim could be premature; previous data have yielded similar signals without confirming dark matter.
Some scientists say the galactic center's complexity and density assumptions challenge the detection claim.
University of Tokyo press materials describe Totani as confident, but other experts urge caution until independent checks
Study authors published their work November 25, 2025 in the Journal of Cosmology and Astroparticle Physics.
The claim centers on a WIMP dark matter candidate and expected gamma-ray signatures from annihilation.
Experts stress independent replication is needed to confirm any dark matter detection.
The University of Tokyo press release frames Totani as confident, yet others call for caution.
Peer commentary highlights the need to compare signals in less messy dwarf galaxies.
NASA data and gamma-ray analyses remain a promising path for dark matter searches, pending verification.
Overall, the story reflects ongoing debate over whether a 20 GeV gamma-ray signal is astrophysical or dark matter in origin.

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