Wormholes: Controlling exotic matter with a magnetic field - art. no. 087502

In this work the junction condition formalism is used to build up wormholes from two identical spacetimes, which are exact solutions of the Einstein-M axwell equations. The surgery produces a class of wormholes in which the am ount of exotic matter is controlled by an external magnetic field. It is de monstrated that the total amount of exotic material is a decreasing functio n of the magnetic held intensity and that most of the remaining material is concentrated near the poles of the junction. A region in which there is no violation of the null and strong energy conditions is determined. The rang e of applicability of the model is discussed in some detail.