In the context of the Multiverse theory, there are different interpretations and models, so the answer to your question may vary depending on the specific framework being considered. I'll provide an overview of two prominent ideas related to the creation of universes in the Multiverse.
- Eternal Inflation and Bubble Universes: According to the theory of eternal inflation, which is an extension of cosmic inflation, our universe is just one of many "bubble" universes that continuously emerge within an ever-expanding multiverse. In this scenario, the Multiverse exists eternally, and new universes are constantly being created through a process called inflation.
During inflation, the rapid expansion of spacetime causes quantum fluctuations, which can give rise to the formation of bubble universes. Each bubble universe has its own set of physical laws and properties. Therefore, if this model is correct, the universes within the Multiverse were not all created at a single event like the Big Bang but rather continuously emerge through inflationary processes.
- Many-Worlds Interpretation of Quantum Mechanics: Another interpretation related to the Multiverse is the Many-Worlds Interpretation (MWI) of quantum mechanics. According to MWI, every quantum event branches into multiple universes, each representing a different outcome. For example, in a quantum experiment, if there are multiple possible outcomes, MWI suggests that all these outcomes manifest in separate universes, effectively creating a Multiverse.
In this interpretation, the branching of universes is not tied to the Big Bang specifically but occurs whenever a quantum measurement or observation takes place. Therefore, the creation of universes in the Multiverse according to MWI is ongoing and not restricted to a single event like the Big Bang.
It's important to note that the Multiverse theory encompasses various hypotheses and models, and scientific understanding is still evolving. While these ideas provide speculative explanations for the existence of multiple universes, further research and empirical evidence are needed to validate or refine these concepts.