The paper claims f(R)-gravity wormholes with nonconstant Ricci scalar can satisfy null and weak energy conditions near the throat in several modified gravity models, but only when the effective gravitational constant is negative.
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Quasi-cosmological Traversable Wormholes in $f(R)$ Gravity
The paper claims f(R)-gravity wormholes with nonconstant Ricci scalar can satisfy null and weak energy conditions near the throat in several modified gravity models, but only when the effective gravitational constant is negative.