One of the theories, called the "many worlds" theory, is the most basic and realistic according to quantam mechanics and fluctuations..It's actually incredibly realistic when comparing this to a parallel universe.. When you wake up in the morning there are so many different decisions to make, and when you choose one option and another and another throughout the day, somewhere in another universe, you are choosing every other decision possible.
"According to quantum mechanics, nothing at the subatomic scale can really be said to exist until it is observed. Until then, particles occupy uncertain "superposition" states, in which they can have simultaneous "up" and "down" spins, or appear to be in different places at the same time. The mere act of observing somehow appears to "nail down" a particular state of reality. Scientists don’t yet have a perfect explanation for how it occurs, but that hasn’t changed the fact that the phenomenon does occur.
Unobserved particles are described by "wave functions" representing a set of multiple "probable" states. When an observer makes a measurement, the particle then settles down into one of these multiple options, which is somewhat how the multiple universe theory can be explained.
Mathematician Hugh Everett published landmark paper in 1957 while still a graduate student at Princeton University. In this paper he showed how quantum theory predicts that a single classical reality will gradually split into separate, but simultaneously existing realms.
"This is simply a way of trusting strictly the fundamental equations of quantum mechanics," says Barrau. "The worlds are not spatially separated, but exist as kinds of 'parallel' universes.""
There are all kinds of real-life experiments going on all the time. At Fermilab in Illinois there's a giant machine called the Tevatron accelerator which collides protons and antiprotons together in an extremely high energy environment. There are so many things that happen to all of those guys when they collide with each other and I don't even know exactly what goes on and it's really hard to find anything out on the website. THere is also one in Europe, which is the largest and highest energy accelerator in the world called the LHC, which collides particles 0.0000001% slower than the speed of light! and the underground track which they are moving on is in TWO countries! Crazzzzy! I found this on wikipedia:"On 10 September 2008, the proton beams were successfully circulated in the main ring of the LHC for the first time. On 19 September 2008, the operations were halted due to a serious fault when there was a helium leak rendering some magnets broken. The LHC will not be operational again until summer 2009." Sad..and how much does that so figure!? It's really interesting to read about what it's doing and planning on doing though..I would highly recommend reading about it.
This was really interesting about the detectors in the LHC so I wanted to add it:
Six detectors have been constructed at the LHC, located underground in large caverns excavated at the LHC's intersection points. Two of them, the ATLAS Experiment and the Compact Muon Selenoid (CMS), are large, general purpose particle detectors. A Large Ion Collider Experiment (ALICE) and LHCb have more specific roles and the last two TOTEM and LHCf are very much smaller and are for very specialized research.
- ATLAS – one of two so-called general purpose detectors. ATLAS will be used to look for signs of new physics, including the origins of mass and extra dimensions.
- CMS – the other general purpose detector will, like ATLAS, hunt for the Higgs boson and look for clues to the nature of dark matter.
- ALICE – will study a "liquid" form of matter called quark-guon plasma that existed shortly after the Big Bang.
- LHCb – equal amounts of matter and antimatter were created in the Big Bang. LHCb will try to investigate what happened to the "missing" anti-matter. <--doesn't this make you wonder now?? YES!
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