multiverse theory

The data neither confirm nor rule out the multiverse theory , which may be helping the proposal to gain traction among physicists .

For some, the question whether there is life in other universes is easy to answer, since the multiple universes would be nothing less than replicas of this universe of ours, in each of which one of the countless possibilities of events that are so dear to life would occur. quantum mechanics.

In this interpretation, every time you make a choice, you influence an infinity of universes, which includes an infinity of other "yous" - some of them leading lives very different from yours because your decisions "collapsed" differently.

This may sound like a concept out of a feverish imagination, but many physicists believe the multiverse is real.

And they present their evidence. Here are four of them, four ways the multiverse could be manifesting itself in our everyday world.

The wave function

It was born as a mathematical entity, although some physicists argue that the wave function is a real entity .

The wave function describes the properties of any quantum system. These properties - the direction of an atom's spin, for example - can take on multiple values at once, in what's known as quantum superposition . But when we measure one of these properties, it always has a single value - in the case of spin, that value is expressed as "up" or "down".

In the traditional Copenhagen interpretation of quantum mechanics, the wave function is said to "collapse" when the measurement is made, but it is not clear how this happens. Schrodinger 's famous cat , neither alive nor dead until someone looks inside its box, illustrates this.

In multiverse theory, the wave function never collapses. Instead, it describes the property across multiple universes. In this universe the spin of the atom is up; in another universe, he is down. When you measure it, you will "unfailingly" find the property value that holds for this universe.

wave-particle duality

In the landmark experiment to make wave-particle duality explicit , photons were sent, one at a time, through a pair of slits, with a phosphorescent screen behind them. The measurement at each of the slits records individual photons, which pass as particles through one or the other slit.

But leave the device running and an interference pattern will build up on the screen, as if each photon had passed through both slits at the same time and diffracted in each of them, like a classical wave.

This duality has been described as the "central mystery" of quantum mechanics. In the Copenhagen interpretation, it is due to the collapse of the wave function. Left to its own devices, each photon will pass through both slits at the same time: it is the measurement that forces them to "choose" one of the slits.

In multiverse theory, however, each photon only passes through one of the slits. The interference pattern emerges when a photon interacts with its clone passing through the other slit in a parallel universe.

computing

Although quantum computers are still in their infancy, they are, in theory, incredibly powerful, capable of solving complex problems much faster than any classical computer.

In the Copenhagen interpretation, this is because the quantum computer is working with entangled and superimposed qubits, which can assume many more states than the binary values available for the bits used by classical computers.

In interpreting multiverses, quantum computers are fast because they perform their calculations in many universes at the same time, with particles exchanging data from one universe to another.

If that seems too strange, remember that, in the most accepted tradition, these particles influence each other even if they are at opposite ends of the galaxy , all instantly - nobody knows how.

Einstein called it spooky action at a distance, while some physicists already argue that there are hidden influences beyond spacetime: Schrodinger's cat yourself.

You'll need a gun whose fire is controlled by a quantum property, like the spin of an atom, which has two possible states when measured.

If the Copenhagen interpretation is right, you have the familiars a 50% chance of survival. The more times you "play", the less likely you are to survive.

If the multiverse is real, on the other hand, there will always be a universe where "you" are alive, no matter how long you play. What's more, you could always end up in it, thanks to the elevated status of the "observer" in quantum mechanics. You'll just hear a series of clicks, as the weapon's firing will fail every time.

In other words, "you" will realize that you are essentially immortal - the problem is that it is not exactly this "you" that you now call me.

So maybe it's better not to try, if only because these are all hypotheses or theories - or interpretations of hypotheses and theories

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