Let us suppose that we have a system of multiverses, each universe within the multiverse existing as a higher-dimensional hyperspherical bubble within the yet higher-dimensional multiverse.
There have been theories about ekpyrotic universes, where M-branes collide, each collision triggering a new big-bang. However, I am considering something with much lower energy... where the two universes sit very close together, and vibrations of the universes' structures as a result of the energy of their contact leads to them meeting and parting at semi-regular intervals, until they either merge permanently or pass out of range of each other.
The universes in question would be similar to - or would be - our own, enough so that humans could exist in both, though with very slightly different physical constants. Each universe would have its own time dimension, running at a slightly different rate to that of its neighbor's, seperate to a multiversal time dimension which governs the movement of universes within the multiverse.
What I had in mind was something like the following: Billions of years ago, a previous universe was restarted in a violent ekpyrotic event, splitting into two universes. Then, a few billion years ago, the two new universes collided relatively gently, like two soap bubbles touching. The reverberations within the two universes led to the contact breaking and resuming over the subsequent inter-universal time many times, at a decreasing interval and violence, until the two universes reach a stasis with a small volume of intersection, ar least until the gravitational influence of another passing universe pulls the two apart again.
With the two universes in contact, wormhole-mouths would open between the two at the contact points or the two universe's matter would cross over. Because the universes are wrinkled, contact would not be uniform over a very large area, but would occur over a number of relatively small points over the general area of the greater point of contact. Because the areas of the universes have been in gravitic proximity for a great deal of time, matter tends to accumulate in the corresponding parts of the other, so there are parallel stars and planets in the zone of contact. Because of relative frames of reference, the curvature of spacetime would remain relatively constant with respect to the nearest, largest mass, though they may drift slowly over time.
Because the universes each have their own time dimensions, time would pass in each at different rates, though at a fixed ratio - while in contact. When not in contact, movement of the universes relative to one-another would result in the contact zones being slightly different during subsequent collisions, both in space and time...
So to the question:
Is this a feasible way to have a reasonably believable 'Different dimensions merging into one another' scenario? Could it be improved?