Speeding up time?
Any ideas how an advanced alien race could speed up time in a specific region of space?
I'm working on a storyline in which an alien race uses a time bubble to accelerate time so the construction of a structure can conclude quickly, as seen by outside observers. (The bubble is faster on the inside!)
I'd like this to be reasonable in plausible science fiction, not just a trope, to the extent possible.
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There's no way to achieve this in the known laws of physics.
However given that near a mass the time "goes slower". I guess if you could create a negative mass, near it time should "go faster". So if you assume there's a way to create a large negative mass, then you could do that near that mass.
OK, so how do you create negative mass? Well, you create negative energy, because thanks to $E=mc^2$ you then get negative mass.
But how do you create negative energy? Well, you simply postulate a field that has negative energy. Such a negative energy field doesn't exist in the real word (and probably would cause major problems), but unless you're writing hard-SF I think it's an acceptable deviation from reality.
So your aliens create a bubble of strong phlebotinum field which has negative energy, and due to that negative energy time goes much faster. Note that you'll have strong anti-gravitation; that is, you'll need to invest a lot of energy to get into that bubble. Probably it would be best to first bring all the materials into the space volume, and then activate the field bubble.
If you don't prevent it, things in that bubble will fall outwards. You might have a sphere where you can walk on the inside due to that outwards force (the sphere would be stabilized by the outwards force the same way as a balloon is; of course it would have to be strong enough to support all the structures built on it).
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