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Vacuum Cherenkov Radiation for Nonminimal Isotropic Lorentz Violation

Published 5 Mar 2026 in hep-ph and hep-th | (2603.05679v1)

Abstract: In this work, we study the effects of vacuum Cherenkov radiation caused by nonminimal dimension-5 Lorentz-violating (LV) operators in the fermion sector. Explicitly, we focus on two independent isotropic pieces of each set of nonminimal coefficients. Under the assumption that vacuum Cherenkov radiation is an expected phenomenon, experimental data of ultra-high-energy cosmic rays (UHECRs) allow us to put stringent bounds on isotropic coefficients in quarks.

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