One theory of multiverse states that somewhere out there is another planet just like Earth, but we are unable to see it because our cosmic sight is limited by the speed of light. We can only see within our Hubble volume which represents our observable universe.
Another leading theory theory is that the space between other possible universes is infinitely expanding, making it impossible to ever reach. There are two sub-theories to this; the first being eternal inflation which states that in this infinitely expanding space, an infinite number of universes is created. The second sub-theory is the Ekpyrotic theory which goes even further and states that two universes collide in multiple locations, creating multiple universes at one time rather than one separate universe within so much space. Think of each universe as a battery and each has a different charge. When the walls of these branes collide, they give and take a bit (or maybe even all) of the energy from the other. This quick transfer of energy and mass is one of the leading theories because many believe this is where the Big Bang came from, a collision.
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| Two Branes Colliding |
An unpopular theory states there are many separate but coexisting universes which affect each other. For example, my decision right now changes the life of myself in a different world. Theorists use this method to try and explain spontaneous quantum behaviors.
In 1995, a man named Edward Witten postulated that different universes existed neatly stacked on separate planes of dimension based on the brane sizes of the universes. He described our's as a brane-3 and we exist in a dimension called "the bulk", and only other brane-3 sized universes can exist in this sub-realm.
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| Neatly Stacked Branes |
What is your opinion? Do you think these parallel universes exist?
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