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Assuming the following

  1. A universe is the surface from a bubble in hyperspace. Inside a bubble there is nothing, only the surface represents a universe. The size of the bubble is time.

  2. Dark matter is from bubbles different then our own bubble that only shares gravity.

  3. The big bang are bubbles colliding, creating a other bubble.

My problem is if bubbles do only share gravity why would they have a collision, I expect that they would just pass trough each other without creating a big bang?

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Where did you get these three points from? – Rhys Nov 18 '12 at 20:08
My understanding from Michio Kaku representation on youtube :) Just trying to understand hyperspace a little bit. – Gert Cuykens Nov 18 '12 at 20:15
I think I found the video. My opinion is that you are better off ignoring all that stuff (and perhaps the whole video). 'Hyperspace' is not a term that physicists use, and Kaku mixes up two completely different 'bubble' pictures in the 34th (or so) minute of that video. The first bubble is, as you say, a rough representation of our expanding universe, and only the surface of the bubble should be seen as real. The next bubbles he talks about are completely different; they represent an extremely speculative idea, and they really are more like "bubbles in the universe" (or 'multiverse'). – Rhys Nov 18 '12 at 20:24
This is the colliding part that I would like to understand Its not the theory of the collision itself that I do not follow, but the difference in concept of dark matter that can not collide with a parallel universe? If I can touch dark matter, then I can understand why such a collision between universe would happen. – Gert Cuykens Nov 18 '12 at 20:43
Personally my advice is to ignore anything that Kaku says which is pitched to a popular audience. I'm sure he's a smart guy, but unfortunately he's taken to making the wildest speculations that are barely attached to reality in an attempt to make physics "sexy." This is to the detriment of real physics, which is really exciting and interesting and actually supported by evidence! People deserve to know what physicists are really finding out. This hyperspace stuff is just silliness. sigh Rant over. – Michael Brown May 3 '13 at 3:58

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