Brans-Dicke and related Euclidean wormholes

In a recent paper(1) Euclidean wormhole solution has been obtained with a vacuum Brans-Dicke theory with parameter omega = 0. These wormholes suffer from unphysical values of the gravitational constant. One can relate the various known wormholes by means of conformal transformations; although one should not transform them directly to the Einstein frame as the gravitational constant there is "forced" physical: so removing the wormholes. However, by arguing for the existence of a fundamental minimum length scale such wormholes can now be considered as representative of quantum gravitational phenomena. One can also obtain wormholes as solutions of the quantum mechanical Wheeler-De Witt equation; now in Brans-Dicke for any omega > -3/2.