Publicación: RADIATIVE CORRECTIONS TO LORENTZ-INVARIANCE VIOLATION WITH HIGHER-ORDER OPERATORS: FINE-TUNING PROBLEM REVISITED
Fecha
2015
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NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
Resumen
WE STUDY THE POSSIBLE EFFECTS OF LARGE LORENTZ VIOLATIONS THAT CAN APPEAR IN THE EFFECTIVE MODELS IN WHICH THE LORENTZ SYMMETRY BREAKDOWN IS PERFORMED WITH HIGHER-ORDER OPERATORS. FOR THIS WE CONSIDER THE MYERS AND POSPELOV EXTENSION OF QED WITH DIMENSION-FIVE OPERATORS IN THE PHOTON SECTOR AND STANDARD FERMIONS. WE FOCUS ON THE FERMION SELF-ENERGY AT ONE-LOOP ORDER AND FIND SMALL AND FINITE RADIATIVE CORRECTIONS IN THE EVEN CPT SECTOR. IN THE ODD CPT SECTOR A LOWER DIMENSIONAL OPERATOR IS GENERATED WHICH CONTAINS UNSUPPRESSED EFFECTS OF LORENTZ VIOLATION LEADING TO A POSSIBLE FINE-TUNING. FOR THE CALCULATION OF DIVERGENT DIAGRAMS WE USE DIMENSIONAL REGULARIZATION AND CONSIDER AN ARBITRARY BACKGROUND FOUR-VECTOR.
