
Art by Slawek Wojtowicz, 1997
The concept of parallel universes is not just a whimsical notion found in science fiction. Ever since the early days of quantum physics there have been scientists who take the idea very seriously. Today the idea of an infinite number of parallel universes has become mainstream. Though not yet a proven fact, the concept of parallel universes has broad explanatory power and reconciles certain contradictions in quantum theory.
Most people believe in at least one parallel universe without even realizing that’s essentially what they are believing. Ask someone where they think they go when they die. Whether they call it heaven or the spirit world, it is in essence a parallel universe. When the Copernican Revolution forced people to abandon the idea that heaven is on the other side of the starry canopy, the canopy itself
being just beyond Saturn (Uranus and Neptune were not discovered yet), the location of heaven became somewhat ill-defined. Where is it? Smells like a parallel universe to me.
There are a few different types of parallel universes postulated by physicists. Some exist as expansions of other big bangs outside of the space-time continuum of our universe. Some exist in other dimensions in certain interpretations of string theory. Some exist on different time-scales (before our universe was born, after it dies), and some exist in the same space as our universe, but are a manifestation of a different branch of the so-called quantum wavefunction. This is the type of parallel universe that I will discuss below.
Now let’s delve just a bit into the weird world of quantum physics. Subatomic particles such as electrons, protons, and neutrons are convenient concepts for understanding physical reality. But they exist only in the mind. Without getting too deep into the arcana of quantum physics I will try to explain the concept of the collapse of the wave function. A subatomic particle does not exist until an act of observation causes it to materialize. OK, I know it sounds weird to those of you who haven’t studied quantum physics, but let me go on. A subatomic particle only exists as a sort of cloud of probabilities defined by what is called the wavefunction. The amplitude of the wave at each location determines the probability of finding the particle at that location. The act of observing with a scientific instrument causes the wavefunction to collapse and the particle comes into existence in a certain location. For a more detailed account of these concepts you should look up the double-slit-experiment and “Schrodinger’s Cat.”
There has been a great deal of controversy over the seeming randomness of the wave function collapse. This is what provoked Einstein to say that God does not play dice with the universe. There has perhaps been even more controversy as to what exactly causes the collapse of the wave function. Is it caused by the probing with a scientific instrument or is it caused only by conscious observation? How can all of the subatomic particles in the universe exist only as a waveform of probabilities until an act of observation collapses the waveform? Over fifty years ago physicist Hugh Everett postulated that the quantum waveform exists as a superposition of all possibilities, and the reality we perceive is created by a process he called decoherence. The phenomenon of decoherence was introduced as a way of explaining why the reality perceived by quantum physics experiments looks like it is based on probabilities. In a sense it is a corollary of another rather arcane quantum concept called entanglement.
I won’t attempt to describe decoherence in detail, mostly because my understanding of it is somewhat limited, but decoherence creates a reality that looks like a random collapse of the wavefunctions of particles, but in fact the wave functions never collapse. The reality we perceive is but one possibility of the wavefunction, every particle immediately (on a timescale unimaginably small) affecting all other particles and causing them to all exist as a manifestation of a certain part of the wavefunction. But the entire wavefunction still exists, and this opens the door to some rather exotic possibilities.
This is all rather bizarre and impossible to really understand, but it is all part of modern physics. The main point I want to make is that the decoherence of the wavefunction opens the door to the concept of one or more parallel universes that exist in the same space-time continuum as ours, but are not perceived by us. Well, not usually perceived by us. Now let me go a bit beyond the science and get really weird.
What if a being from such a universe is able to consciously (or accidently) adjust the quantum wave function of the matter that makes up his body? Could some strange being suddenly materialize in your living room? Could such a theory explain such manifestations as ghosts, poltergeists, UFOs, angels, demons, and even bizarre things like Bigfoot and chupacabra?
Let me end this by saying that our“consensus reality” is not the ultimate reality, but is only one of many realities (infinite?)created and supported by a higher reality or higher consciousness. Our “consensus reality” is like the shadows on the wall of Plato’s cave.