General class of vacuum Brans-Dicke wormholes

Recently, traversable wormhole geometries were constructed in the context of $f(R)$ gravity. The latter is equivalent to a Brans-Dicke theory with a coupling parameter $\ensuremath{\omega}=0$, which is apparently excluded from the narrow interval, $\ensuremath{-}3/2<\ensuremath{\omega}<\ensuremath{-}4/3$, extensively considered in the literature of static wormhole solutions in vacuum Brans-Dicke theory. However, this latter interval is only valid for a specific choice of an integration constant of the field equations derived on the basis of a post-Newtonian weak field approximation, and there is no reason for it to hold in the presence of compact objects with strong gravitational fields. In this context, we construct a general class of vacuum Brans-Dicke wormholes that include the value of $\ensuremath{\omega}=0$.

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