MWH+(Christian,+Casey,+Joe)

=Many Worlds Interpretation=



Introduction
The Many Worlds Interpretation (also known as the //Many Worlds Hypothesis//) is an interpretation of quantum mechanics. MWI states that whenever several outcomes of an event are possible, the world will split into multiple worlds, each identical at first, except for the fact that each world contains a possible outcome of the event.[1] These almost identical worlds exist in unison in the same space and time. According to Everett, any time a quantum experiment with multiple outcomes is performed, the world splits. These quantum experiments can be as simple as the irregular flickering of an old light bulb, or set up experiments such as Schrödinger's cat.[8] toc

**Science behind MWI**
 This is the basic idea behind the many worlds hypothesis, that the observation of quantum states splits the universe into two.  The science behind the many worlds interpretation is very abstract thinking. Whenever something at the quantum level, such as an electron, interacts in some way with the macroscopic world, the single universe branches off into two in which different outcomes occur. For example, when an electron is measured, it is either spin up or spin down. Let’s say that it’s measured to be spin up; while it is spin up in this universe, the moment it was measured the universe split into two; one where the electron is spin up, another where its spin down.

**Quantum Suicide Experiment**
There are many ways for this to be tested. One is the quantum suicide experiment. In this experiment, a gun is connected to a device that will measure an electron. If the electron is measured to be a certain spin, the gun will fire. If the electron is measured to be the other spin, the gun will not fire. According to the many worlds interpretation, the universe splits into two when the electron is measured. In one universe therefore, the gun fires killing the experimenter. In the other universe the gun does not fire and the experimenter lives to test this again. If the gun does not fire, it is reset and the electron is measured again. And again, the universe splits into two one where the experimenter is killed another where he is not. This means that in some universe, the experimenter will always remain alive. This is referred to as quantum immortality. [[|3]] This video is a good example of quantum immortality: media type="youtube" key="T2OytHzZ72Y" height="344" width="425" align="left" In this video, someone is playing a game of quantum Mario. In the game, there many many Marios all running around on the screen, one for each possible outcome of his adventure. As one can see, many of the Marios die when they accidently jump in the wrong place. However, at least one always remains alive as that is always a possible outcome.

​** The hypothetical experiment thought up by Erwin Schrodinger involving a cat and poison gas helps to illustrate MWI. In this experiment, a cat is placed in a box. In this box is also a radioactive atom and a flask of poison gas. a Geiger counter then measures to see if the atom releases an alpha particle. (Note: this experiment would work with any quantum reaction, for example measuring the spin of an electron.) The atom's current wave function is in a "superposition" of both decayed and undecayed states. For this reason, before the Geiger counter starts measuring, the cat is also in a superposition of both dead and alive states. Only when it is measured does the wave function collapse and the outcome is decided. [[|9]]
 * Schrodinger's Cat

Universes split when certain quantum “superpositions” “decohere” from each other. [ [|5] ] For two worlds to exist as one, the atoms of those worlds have to be in the same states usually meaning in the same spot. When they “decohere”, this one universe splits into two. When it is a complex system such as our whole universe, the process cannot be undone. This explains it well: “ Worlds, or branches of the universal wavefunction, split when different components of a quantum superposition "decohere" from each other. Decoherence refers to the loss of coherency or absence of interference effects between the elements of the superposition. For two branches or worlds to interfere with each other all the atoms, subatomic particles, photons and other degrees of freedom in each world have to be in the same state, which usually means they all must be in the same place or significantly overlap in both worlds, simultaneously.” [[|5] ]
 * Superpositions and Decoherencey**

==Hugh Everett III== Hugh Everett was the man behind MWI. Everett was mathematician, and a quantum theorist.6] His dissertation was published in 1957, but it had been edited, and changed quite a bit from the original. After publication, many thought the theory was crazy, but when he finally got the full dissertation published in 1973, many questions were answered, and others started to accept his theory.[7]

media type="youtube" key="udgR2gcgNzI" height="344" width="425" align="left"

**"Many Worlds" a chemistry parody by Joe and Casey of "One by One" by Immortal**
Many worlds, this is an explanation Led astray, by electron measurement When you measure it, only then its known Whether its, spin up or spin down

Schrödingers cat is dead Only in one universe Schrödingers cat is dead But he is alive in another

This will come from, any quantum reaction When you measure, it splits into two One youre dead, the other alive A consequence would be, immortality Quantum suicide, you are always alive Its no matter what you're always there Some will explain, were missing something But the many worlds will always be here

Many worlds, this is an explanation Led astray, by electron measurement Many worlds, is the outcome of quantum Many worlds, controlled by the spin of them all Still just hypothesis, but its quite likely That this is what controls our worlds Many worlds, it rules your life

Many worlds across the meadows Where quantum once ruled the steps Where the ancient chemists of yore Are respected and honored by time Strong were those hypotheses And the legends tell only of genius As brothers of the german land They thought of the many worlds

(Yes we know it was an American but German fit better. Anyways, there Were a lot of German physicists at the time...)

We leave their territory Where they are quantum masters Unforgotten by students Who learn of their great deeds


 * Importance of the Many Worlds Interpretation **

**Credibility**
The Many Worlds Interpretation is a highly relevant topic in the field of quantum mechanics. It is difficult to explain what is happening at the atomic level where forces and matter are so minute. There are multiple explanations and interpretations some less accepted than others. However the only interpretation so far that is free of inconsistencies and works as a reductionist model of reality is Everett's Many Worlds Interpretation. Ideas such as the Copenhagen Interpretation, Hidden Variables, Quantum Logic, Many-Minds, and other even less heard of ideas contain inconsistencies. Some work in some situations and not others and some apply different rules to other things in the same universe which is not possible. In recent years a physicist named David Wallace discovered that the math behind the Many Worlds Interpretation "checks out". Wallace was following up on the work of David Deustch who had begun a mathematical explanation. [[|4]] Unfortunately I am unable to provide further explanation as to how he figured it out because of the complexity his work. The Many Worlds Interpretation is a respected theory and according to a study is accepted as their belief by 58% of 72 "leading cosmologists and other quantum field theorists". Among these include Stephen Hawking and Richard Feynman. [[|5]] With all the non-contradictory support of mathematics and logic behind it, the Many Worlds Interpretation is used constantly by many physicists. So for one, the Many Worlds Interpretation is important to you and I because many chemists and physicists of the world are striving towards new technologies and scientific understandings using that interpretation.

**"In Another World Your Lottery Ticket Was the Winning One"**
There is another and perhaps more important item to consider when considering the effect that the Many Worlds Interpretation has on the life of human beings. Perhaps you've wondered what it would have been like had you not done something you did in the past. Maybe you've thought about how things would be if you had made different choices or simply different things had happened to you. According to the logic of the Many World's Interpretation every outcome is not only possible but existent. Only one outcome occurs in each "World" but they all do in fact occur. The Interpretation is intended for outcomes at the atomic level but these atomic outcomes build on each other and create larger and more extreme outcomes. A more extreme outcome could be something like changing the winning lottery number to be yours or something to that effect. You can imagine anything you want and there's a world for it. So if you feel down about something you did or didn't do, well there's a world where you didn't do that which you shouldn't have and you did do what you should have!

**Pop Culture...Yes, Pop Culture**
The Many Worlds Interpretation is clearly an interesting topic and the idea of there being many worlds in existence only slightly different from each other has been used in Hollywood and on television. Here is an example from the hit show "//Star Trek"// [|Parallels] (Embedding not permitted)

Commander Riker is communicating with someone just like him in another "world". The other world is one of the infinite number that exists. As cool as this seems however the science does not quite check out. Everett's Many Worlds Interpretation explains how for the theory to work, there can't be interference between the worlds.