Astrophysicists Tighten Limits On Light Speed Variations
In 2026 an international team of astrophysicists published a study this month testing whether light speed varies with photon energy by analyzing ultra-high-energy gamma rays from distant bursts. Using observatories including the High-Altitude Water Cherenkov (HAWC) facility, they found no energy-dependent delays, tightening Lorentz-invariance violation limits by up to 100× to around 10^-17. This narrows quantum-gravity parameter space and guides future observatory strategies.
Scoring Rationale
Strong experimental tightening of Lorentz-violation bounds; limited by aggregated reporting and lack of primary-journal citation.
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