I wrote a post about time travel and in researching the post I ended up delving into parallel universes as one possible way to time travel.
Brian Greene, physicist and science writer, wrote The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos asking "Is our universe the only universe?"
In the multiverse, there is a duplicate of every one of us. Greene discussed nine types of parallel universes. This is not simple.
The quilted multiverse conditions in an infinite universe necessarily repeat across space, yielding parallel worlds.
The inflationary multiverse says that eternal cosmological inflation yields an enormous network of bubble universes, of which our universe would be one.
The brane multiverse states that in M-theory, in the brane world scenario, our universe exists on one three-dimensional brane, which floats in a higher dimensional expanse potentially populated by other branes – other parallel universes.
The cyclic multiverse is saying that collisions between braneworlds can manifest as big bang-like beginnings, yielding universes that are parallel in time.
The landscape multiverse states that by combining inflationary cosmology and string theory, the many different shapes for string theory's extra dimensions give rise to many different bubble universes.
The quantum multiverse creates a new universe when a diversion in events occurs, as in the many-worlds interpretation of quantum mechanics.
The holographic multiverse is derived from the theory that the surface area of a space can simulate the volume of the region.
The simulated multiverse implies that technological leaps suggest that the universe is just a simulation.
The ultimate multiverse is the ultimate theory, saying the principle of fecundity asserts that every possible universe is a real universe, thereby obviating the question of why one possibility – ours – is special. These universes instantiate all possible mathematical equations.
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