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GAUGE COUPLINGS CALCULATED FROM MULTIPLE POINT CRITICALITY YIELD α<sup>-1</sup> = 137 ± 9: AT LAST, THE ELUSIVE CASE OF U(1)
We calculate the $U(1)$ continuum gauge coupling using the values of action parameters at the multiple point in the phase diagram of a lattice gauge theory. The multiple point is where a maximum number of phases convene. We obtain for the running inverse finestructure constant the values $\alpha_1^{-1}=56\pm 5$ and …