Wormhole geometries in f(R) modified theories of gravity

摘要: In this work, we construct traversable wormhole geometries in the context of f (R) modified theories gravity. We impose that matter threading satisfies energy conditions, so it is effective stress-energy tensor containing higher order curvature derivatives responsible for null condition violation. Thus, terms, interpreted as a gravitational fluid, sustain these nonstandard geometries, fundamentally different from their counterparts general relativity. particular, by considering specific shape functions and several equations state, exact solutions f(R) are found.