Travel from one spacetime to another?

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Would it be possible in the future to travel from one spacetime to another, if others exist?

How are you defining spacetime?

If by spacetime you mean a parallel universe complete separate from this one... maybe. From my (limited) knowledge of this, it would require us to open a wormhole connecting the two universes. So, if stable wormholes are possible in reality, rather than just in mathematics, then we might be able to.

Doesn't this presuppose that the laws of physics are the same in both universes? I believe there is nothing that ensures this in the current theories. That raises the interesting question of what happens if you step into a universe with different laws.

Unlikely. It would violate conservation laws.

ruveyn

That's true I suppose. This makes me think of Asimov's The God's Themselves. A technology was developed to transfer matter between universes. The conservation laws were broken because of Asimov's physics saying that the laws of the two universes would tend to diffuse and reach equilibrium. Basically you could say the difference in the natural laws stores potential energy. If the natural laws and constants can't equalize (which Asimov described as quite a dangerous process, in any case--it could screw up fusion in the sun and cause it to go nova, among other things) then the conservation laws would be truly broken I suppose. I don't know... this would be entirely new physics. But it's fascinating.

Somebody's been watching re-runs of Time Trax