Could black holes be driving the expanding universe (dark energy)? I would like to start be saying I'm no Physicist.
Anyway, my question is: Could black holes be driving the expanding universe (dark energy)?
When I think of the image that the effect of massive objects have on space/time (gravity) and the so-called curvature it creates, it makes sense to me as far as moons, planets, stars etc.
But what interests me is, what is the extent that a black hole has on space/time curvature?
Rather than stretching space/time down into a well, could the stretching be happening in reverse so to speak? Is it mathematically possible to estimate all the black holes and their sizes and to account for this much stretching/energy? 
Okay, I see where my wording has gone wrong to the question I was initially trying to ask. The question was not about the 'curvature' of space/time but rather the 'creating' of space/time with black holes. Kind of like space/time fabric creating/expanding machines. The systems that gravitate towards each other, such as the Milky Way and Andromeda would not seem to be affected or stretched apart due to gravitational forces but everything outside of these gravitational forces would expand away.
Take a sun for instance, it has a finite impact on the curvature of space/time fabric, but take that same sun and make it a black hole and the impact on the curvature of space/time seems different to me at or in the event horizon. Infinite stretching so to speak. With the results of the fabric expanding outward in all directions.
 A: An object becoming a black hole does not affect its gravitation strength. If the sun became a black hole, orbits would be the same.
A: the simplest models for expanding universe (see frw metric) don't have any curvature term for 3 space, as constructed from experimental data.
however using black holes to model systems do result in inserting curvature terms for 3 space, and as a result we can't use them to model expanding universe.
A: Many physicists are researching dark energy and the particle science behind it. There are many theories about what happens beyond the horizon of a black hole. Some people believe in something similar to your question. Its a theory about how things passing through a black hole travel into the multiverse and possibly creating more universes. This theory consists of many thoughts on how black holes could be expanding the universe. But we cannot be sure.
A: It's almost as if the universe is growing from the inside out. The matter that passes the event horizon becomes the dark matter at its expansion. Like a big belly growing seemingly infinitely. Thst matter does not escape the blackhole. It does not leave the universe. It's mass is simply what drives that growth- just faster than the speed of light since light cannot escape the blackhole, whatever is coming out of has to be traveling faster. That's why it seems to be growing infinitely. The mass isn't lost- it is simply being transferred from the innermost to the outermost in a seamless cycle. 
