if a wormhole for example is opened in space to a similar universe to ours, then would time flow rate wud be exactly equal in these two universes or not? what can we say about the smoothness of the wormhole at exact time synchronisation?

Well first we'd have to know what exactly it meant for there to be another universe, so far we've only been able to look at this one.

Then we'd have to find out that wormholes did indeed exist.

Then we'd have to find a way to link them to other universes (as far as I know the concept of a wormhole as taken anywhere near seriously by scientists only pertains to links between points in our spacetime).

Then we'd have some idea of how to answer your question.

Assuming this wormhole can really go from one universe to the other (a huge assumption) and assuming this other universe, whatever this is, obeys the same physical laws as ours, then I think the rate at which time passes in this other universe would depend on how much mass and energy there is in this universe.

Edited April 4, 201114 yr by I ME