Low-energy constraints on κ-Minkowski extension of the Standard Model

摘要

We investigate the phenomenological consequences of κ-Minkowski extension of the Standard Model,working in the linear order in inverse κ. At this order the -deformed Lagrangian can be expandedin the series of dimension five operators that have non-trivial transformation properties under theordinary Lorentz invariance. Such operators cause the Lorentz-violating signatures at low energies, andin particular lead to the anomalous spin precession linked to the external direction. The experimentalbounds on this phenomenon then restrict parameter κ to be above 1023 GeV, making it difficult toimpose a direct connection between this theory and quantum gravity.