Understand
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 w=0, which is apparently excluded from the narrow interval, -3/2<w<-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 w=0.