Constraints on Lorentz Invariance Violation in Neutrino Sector from the Ultra-High-Energy Event KM3-230213A

2025 · doi:10.32388/3fpl9u
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Abstract

Lorentz invariance is a fundamental symmetry of spacetime and serves as the cornerstone of modern physics, supporting the constancy of the speed of light. A crucial implication of this principle is that no particle can propagate faster than this universal speed limit. In this study, we present a stringent neutrino-based test of Lorentz invariance, utilizing the highest-energy neutrino ever detected, known as event KM3-230213A. The detection of this neutrino, with measured energy of approximately 220 PeV, allows us to establish a lower bound on the scale of second-order Lorentz invariance violation, quantified as \(\Lambda_2 > 5.0 \times 10^{19}\) GeV at 90 % confidence level.
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