In the context of the multiverse theory, it's important to note that different interpretations exist, and the concept of "aliveness" may vary depending on the interpretation. However, in most interpretations, the notion of "aliveness" is not typically applied to universes themselves but rather to the conscious beings or observers within those universes.
According to some interpretations of the multiverse theory, every possible outcome of a choice may manifest in a separate universe. This means that each outcome would have its corresponding universe with different configurations or states. In this view, all these universes would be equally real but exist independently of one another.
The concept of "aliveness" is generally associated with the conscious experiences of individuals within a given universe. From this perspective, a person would perceive themselves as "alive" in the particular universe they inhabit, experiencing their unique set of circumstances and events. The other potential outcomes of their choices would be experienced by different versions of themselves in separate universes.
It's worth mentioning that the multiverse theory is a speculative idea that aims to explain certain aspects of our universe, but currently, there is no definitive empirical evidence to confirm its existence. Different interpretations and theories within the multiverse concept can vary, so ideas about "aliveness" and the nature of universes can differ as well.