at1with0 wrote:Or perhaps atoms exist in multiple parallels simultaneously.
Indeed, the double slit experiment even displays wave particle duality for some types of macromolecules.
The larger a particle, the smaller its DeBroglie wavelength. So bigger macroscopic beings perceive themselves as existing in one universe, while individual micro-particles can exists in multiple realities simultaneously.
Penrose speculates that the transition between macroscopic and quantum states begins at the scale of dust particles (the mass of which is close to a planck mass). Dust particles could exist in more than one location for as long as one second, a time that is easily measurable with standard equipment. He has proposed an experiment to test this theory, called FELIX (Free-orbit Experiment with Laser Interfometry X-Rays), in which an X-ray laser in space is directed toward a tiny mirror, and fissioned by a beam splitter from tens of thousands of miles away, with which the photons are directed toward other mirrors and reflected back. One photon will strike the tiny mirror moving en route to another mirror and move the tiny mirror back as it returns, and according to conventional quantum theories, the tiny mirror can exist in superposition for a significant period of time. This would prevent any photons from reaching the detector. If Penrose's hypothesis is correct, the mirror's superposition will collapse to one location in about a second, allowing half the photons to reach the detector.
Kaku says the question about flipping between universes is a question that hasn't really been answered yet... Macroscopic objects cannot jump between decohered universes but perhaps small segments of our consciousness can communicate with our alternate consciousnesses in the other branch worlds...
However, it does raise the other question: is it ever possible on any scale to perhaps flip between different universes? And the answer there is actually rather unclear. We physicists believe, for example, that there is really a multiverse that exists even inside our living room. We are waves, vibrating waves given by the wave-function, and these waves vibrate and then split apart with time.
Steve Weinberg, winner of the Nobel Prize, compares it to the following. Think of radio. If you’re inside your living room listening to BBC radio, that radio is tuned to one frequency. But in your living room there are all frequencies - radio Cuba, radio Moscow, the Top 40 rock stations. All these radio frequencies are vibrating inside your living room, but your radio is only tuned to one frequency.
Now, in other words when two universes are in phase, they are coherent and you can move back and forth. But as time starts to evolve, these two universes decouple. They start to vibrate at different frequencies. They can no longer interfere with each other. So why is it that your radio cannot listen to Radio Moscow? Why isn’t it possible for your radio to listen to all frequencies? Because your radio is decohered. It is no longer vibrating in unison with these other frequencies.
And the same thing in quantum physics. We consist of atoms. Our atoms vibrate, but they no longer vibrate in unison with these other universes. We have decoupled from them, we have decohered from them. So in other words, deja vu is probably simply a fragment of our brain eliciting memories and fragments of previous situations. However, in quantum physics, there really are in some sense parallel universes surrounding us, the problem is, we can’t enter them because we have decohered from them. We’re no longer vibrating in unison with them. Sorry about that.