Gravitational Correction to Running of Gauge Couplings

Sean P. Robinson, Frank Wilczek
2006 Physical Review Letters  
We calculate the contribution of graviton exchange to the running of gauge couplings at lowest non-trivial order in perturbation theory. Including this contribution in a theory that features coupling constant unification does not upset this unification, but rather shifts the unification scale. When extrapolated formally, the gravitational correction renders all gauge couplings asymptotically free.
doi:10.1103/physrevlett.96.231601 pmid:16803367 fatcat:xav7vfaq7jcfte47lflrx2ojny