What is Many-Worlds Interpretation?

Many-Worlds Interpretation (MWI) is a theory in quantum mechanics that suggests that every possible outcome of a quantum event exists in a parallel universe. According to this interpretation, when a measurement is made, the universe splits into different versions, each with a different outcome. So, instead of there being just one outcome, there are multiple outcomes, all happening in parallel universes. This means that every possible outcome of a quantum event happens, just in different universes.

The Theory Behind the Many-Worlds Interpretation

The Many-Worlds Interpretation is based on the idea that quantum mechanics is a complete and correct theory of the physical world. In this interpretation, a quantum system exists in a superposition of states, meaning that it exists in all possible states simultaneously until a measurement is made. Once a measurement is made, the system collapses into one of the possible states. MWI suggests that instead of just one state collapsing, all possible states collapse, but in different universes, giving rise to parallel realities.

Examples of Many-Worlds Interpretation

To understand the Many-Worlds Interpretation, consider the famous thought experiment called Schrödinger’s cat. In this scenario, a cat is placed in a box with a poison that will be released if a radioactive atom decays. The decay of the atom is a quantum event, and until it is observed, the cat is in a superposition of states of being both alive and dead. According to the Many-Worlds Interpretation, when the atom decays, the universe splits into two versions, one where the cat is alive, and the other where the cat is dead. This means that in one universe, the observer will see a live cat, and in the other, a dead one.

Criticisms of Many-Worlds Interpretation

Many physicists consider the Many-Worlds Interpretation to be highly speculative and unprovable. They argue that the interpretation is not testable, making it difficult to distinguish it from other interpretations of quantum mechanics. Some critics also point out that the theory implies the existence of an infinite number of parallel universes, which seems implausible. Additionally, the interpretation fails to explain how the different universes interact with each other and how the observer fits into the picture. This has led some to question the validity of the Many-Worlds Interpretation as a scientific theory.