Possibilities for a Parallel World

I was just reading about Neutrinos, which are special hard to detect, sub atomic particles. There are a number of mysterious sub-atomic particles, which are known, and there could possibly be others such as dark matter, which are not known.

So, it is quite conceivable that there is a whole parallel world to our own, made up of particles, which interact little with our own world. Furthermore, could some of these particles, or other particles which those particles interact with, form complex matter? Is it really so inconceivable that such matter wouldn't interact with much with us? If so, could life have evolved out of such matter?

If that were the case, we could theoretically have a world parallel to our own in space, whereby there is life. Take it a step further, and the life could even be intelligent. No time travel, or sophisticated transportation, would be necessary for such life forms to interact with us. Although, special methods would probably be required for that matter to interact with our matter.

However, if we assumed the matter behaved relatively similar to our own matter, so far as physics is concerned, and was generated through equivalent cosmic processes, the other world could even closely resemble our world. For instance, the matter could have been tied through some sort of rigid forces, which has since worn away.

So far as quantum uncertainty, is concerned it might be a slightly different world, but there could some degree of entanglement between the two worlds. However, theoretically, I suppose it would be just as easy to say parallel dimension, although such seems to do more to imply no interactivity.

We could even go so far as to wonder if there would be many of these worlds. Some of these could only have one-way interaction, whereby they would influence our world, but our world could not influence theirs. Suppose such interaction required the congregation of large amounts of energy, or something, and it would likely be rare, and could theoretically match many reported effects of the paranormal.

Actually, the newly developed (any highly controversial) String Theory says that there ARE more than one universe.

From what scientists have said, Dark Matter shows the same properties as gravity. Now, gravitons create gravity. Gravitons can pass from one universe to others according to string theory. If this is true then the dark matter that we have could simply be the gravitons of other universes passing through our own universe. It would certainly help explain why dark matter has the properties that it does.