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- W2160436326 abstract "The issue of Lorentz fine-tuning in effective theories containing higher-order operators is studied. To this end, we focus on the Myers-Pospelov extension of QED with dimension-five operators in the photon sector and standard fermions. We compute the fermion self-energy at one-loop order considering its even and odd $CPT$ contributions. In the even sector we find small radiative corrections to the usual parameters of QED which also turn to be finite. In the odd sector the axial operator is shown to contain unsuppressed effects of Lorentz violation leading to a possible fine-tuning. We use dimensional regularization to deal with the divergencies and a generic preferred four-vector. Taking the first steps in the renormalization procedure for Lorentz violating theories we arrive to acceptable small corrections allowing to set the bound $xi<6 times10^{-3}$." @default.
- W2160436326 created "2016-06-24" @default.
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- W2160436326 date "2015-06-01" @default.
- W2160436326 modified "2023-10-16" @default.
- W2160436326 title "Higher-order Lorentz-invariance violation, quantum gravity and fine-tuning" @default.
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- W2160436326 doi "https://doi.org/10.1016/j.physletb.2015.05.006" @default.
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