they are actually investigating microscopic wormholes and seeing how they can be amplified to create macroscopic wormholes. http://arxiv.org/abs/0910.4017

Q. Sonny, I don’t understand how you get macroscopic warps with small amounts of energy. It seems the coupling of mass/energy to spacetime curvature, the factor G/c^4 in the Einstein equations, governs how much mass is necessary to warp spacetime on a given lengthscale. How do the optimization procedures you mention alter this basic scaling? It seems you are saying you have found a way to reduce the effective G/c^4.

A. To echo your observation, yes spacetime is really stiff. The findings suggest that if you oscillate the warp bubble, you can reduce this stiffness, and hence the energy required. I will explain this connection in the upcoming paper.