Why is the quantum world like a reality show with infinite parallel stories?

Imagine living in a universe where every choice you make creates a new reality. It's a bit like a reality show where every episode branches into infinite parallel stories. This is the essence of the many-worlds interpretation, one of the most fascinating interpretations of quantum mechanics. But there's another theory, the de Broglie-Bohm theory, which talks about particles guided by a pilot wave. Both theories agree on one point: the quantum state evolves in a unitary way, without interruptions. The difference? The de Broglie-Bohm theory introduces point particles that move through space, while the many-worlds interpretation explains our observations without the need for hidden particles. The mechanism of decoherence explains why we don't see interference when we measure something. But if the many-worlds interpretation works, the de Broglie-Bohm particles become irrelevant to any observer, like hidden ghosts. Moreover, the violation of locality and Lorentz invariance suggests that these particles might not exist at all. In short, the quantum world is a fascinating mystery, full of possibilities and open questions.

The de Broglie-Bohm theory, also known as the pilot-wave theory, introduces the concept of point particles that follow well-defined trajectories guided by a quantum wave. This theory aims to provide a deterministic description of quantum evolution, in contrast to the Copenhagen interpretation which introduces the concept of wave function collapse. The many-worlds interpretation, on the other hand, proposes that every possible outcome of a quantum measurement is realized in a parallel universe, thus avoiding the problem of wave function collapse. Decoherence, a process through which quantum systems interact with the environment, explains why we do not observe interference in large systems. However, if the many-worlds interpretation is valid, the de Broglie-Bohm particles become superfluous, as the quantum wave alone can explain our observations. The violation of locality implies that de Broglie-Bohm particles could influence each other instantaneously over arbitrary distances, violating Einstein's principle of relativity. This suggests that such particles may not be a realistic physical description of the world.