According to a bunch of stupid theories that you don't want to hear about, wormholes can form in the presences of blackholes, and/or they open and close randomly.
Now you can hold open and inlarge a wormhole by pumbing antimatter-ish (forgot the name) typt stuff into it.
Only 3 problems
1)Where to get the wormhole
2)Where to get the antimatter-ish
3)How to get it into the wormhole
I have a idea that if your dischange enough energy into a small point in space, it may open a wormhole
Negitivly charged ions
PUMPING IT IN
You discharge the energy into the negitive ions
That was short and sweet. It might work.