This seminar presents an effective Lagrangian formulation of the Generalized Uncertainty Principle (GUP) based on Hermitian and gauge-invariant operators, allowing GUP effects to be consistently embedded within effective field theory. Phenomenological bounds on the GUP scale derived from high-energy Compton scattering are discussed, illustrating how precision measurements can constrain GUP-induced deviations. Finally, the impact of GUP deformations on the topological sector of QED is addressed, showing how otherwise unphysical CP-odd terms acquire dynamical relevance and lead to CP-violating effects.
Ana Martín Galán and Francesco Paolo Di Meglio