Fermi-LAT 17-Year Data Confirms Global 20-30 GeV Cosmic-Ray Spectral Break at 4.44 Sigma

{"The analysis accounts for correlated instrumental systematics in diffuse gamma-ray emission along the Galactic plane. By modeling pion-decay dominance up to 100 GeV, the team isolates a slope change of Delta gamma approximately 0.20 that aligns precisely with local cosmic-ray spectra rather than regional variations.","This result overturns assumptions that cosmic-ray spectral hardening is a purely local phenomenon. Instead it supports a shift from Kolmogorov to Kraichnan turbulence as the driver, with implications for particle acceleration models at supernova remnants and the origin of the cosmic-ray knee at higher energies.","Prior Fermi analyses lacked the exposure and systematic control to establish the break globally. Cross-checks with AMS-02 and CREAM proton and helium data strengthen the multimessenger link, showing the feature is not an artifact of solar modulation or local sources.","Future tests require TeV-range mapping with CTA and IceCube neutrino correlations to confirm whether the same turbulence transition persists above the knee, falsifiable within three years if the break amplitude remains consistent."}