“…The fine-structure constant, alpha, has a variety of physical interpretations from which various determinations have been made; atom interferometry and Bloch oscillations, the neutron Compton wavelength measurement, AC Josephson effect, quantum Hall effect in condensed matter physics [11], hydrogen and muonium hyperfine structure, precision measurements of helium fine-structure, absorption of light in graphene [12], also the topological phenomena in condensed matter physics [13], the relative optical transparency of a plasmonic system [14], elementary particle lifetimes [15] and the anomalous magnetic moment of the electron in quantum electrodynamics [16]. Slightly different values of the fine-structure constant are found from different experimental measurements [17] and finally there is also the question of its variation from the subatomic to the cosmological scale [18].…”