In the context of the many-worlds interpretation of quantum mechanics, which is one version of the multiverse theory, the splitting of the universe is not limited to conscious choices alone. According to this interpretation, every quantum event has multiple possible outcomes, and each outcome is realized in a different branch of the universe. These branches represent different possibilities or states of the universe.
The many-worlds interpretation suggests that the splitting occurs at a fundamental level for every quantum event, regardless of whether it involves conscious observers or not. It applies to all particles and systems in the universe, not just those involved in conscious decision-making processes.
This interpretation implies that the universe constantly branches into multiple parallel universes, with each branch corresponding to a different outcome of a quantum event. These branches continue to evolve independently, creating a vast ensemble of parallel universes encompassing all possible quantum states.
It's important to note that the many-worlds interpretation is just one of several interpretations of quantum mechanics, and its implications and details are still a subject of debate among physicists. Other interpretations exist that propose different ways of understanding the nature of quantum events and their relationship to the idea of multiple universes.