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How Many Parallel Universes Exist? Physicists Say There Are ‘Certainly a Lot’

Scientists are actively arguing the concept of parallel universes, with leading theoretical physicist Sean Carroll almost positive that numerous worlds similar to our own exist, as he argued in a documentary.

​Physicists made some major progress in the 20th century when researchers like Albert Einstein, Erwin Schrodinger, and Robert Oppenheimer changed the way we see the world around us. Erwin Schrodinger, the scientist well-known for his quantum mechanical ‘Schrodinger’s cat’ paradox, first came up with the idea that parallel universes exist.

Even though he did not use this exact terminology, he described it during a 1952 Dublin lecture as ‘reality in multiple different histories, not alternatives but all really happening simultaneously.’

How Many Universes Are There?

Theoretical physicists have avidly pursued the concept that all possible outcomes of quantum measurements, or all probabilities, are physically realized in more than one place, instead of just here.

Sean Carroll, an American theoretical physicist, has become this century’s best-known advocate of the theory. His book, ‘Something Deeply Hidden,’ discusses the changes of such realities. He gave his opinion on how many parallel worlds he thinks there are at any time during an interview with Veritasum, a science YouTube channel.

When asked how many times he considered every action splits, creating a parallel world, he said: “The short answer to this is we have no idea how many worlds there might be. I think it’s embarrassing that we don’t have any idea. But, it’s certainly often, it’s certainly a lot. The universe branches whenever a quantum system in superposition becomes entangled with its environment.”

“You have atomic nuclei in your body, they are radioactive – they decay,” he continued. “At 5000 times a second, there’s radioactive decay in your body. Every one of those either decays or doesn’t, you can think of it as a superposition (two states of existence at once). Once it decays, it interacts with what’s around it, it becomes entangled, and the universe branches – its wave function. So branching is happening many many times a second just because of radioactive decays in your body.”

Schrodinger’s Cat Experiment Started It

The concept is that if radioactive decay is triggering a superposition, then many other things also create superpositions in everyday life. It seems to be an endless possibility. However, Professor Carroll explained that whether those decays are occurring infinitely is still an impossible question to answer at the moment.

Schrodinger’s cat experiment first suggested this idea, coming up with a cat inside a box that can be both alive and dead at the same time. [Image Source: Unsplash]
In spite of being a potential for the happening to be infinite, there is still room for numerous alternative realities to come into existence. Schrodinger’s cat experiment first suggested this idea, coming up with a cat inside a box that can be both alive and dead at the same time or any other combination of different possibilities of being both alive and dead.

The thought experiment is at odds with perceptions of how the world works.

The Many Worlds Theory

The experiment performed by Schrodinger says that when we observe something, we force it to make a choice – when you open the box with the cat inside, it appears either dead or alive, but not both.

The thought experiment was created to detail issues presented by one version of quantum mechanics known as the Copenhagen interception. Professor Brian Cox has prior said that the Many Worlds concept offers a reasonable and plausible alternative to what was previously accepted.

During BBC’s Life Scientific program in 2014, he said: “That there’s an infinite number of universes sounds more complicated than there being one. But actually, it’s a simpler version of quantum mechanics. It’s quantum mechanics without wave function collapse… the idea that by observing something, you force a system to make a choice.”

For many years, the Copenhagen interpretation of quantum mechanics, which allows for only one universe to exist, was the theory that dominated particle physics. The hypothesis is now being provoked by the Many Worlds theory; however, until clear evidence is provided, researchers will keep disagreeing about how nature should be seen.


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