According to the many-worlds interpretation, the branches o…

According to the many-worlds interpretation, the branches of reality already exist, and are not created by the act of time travel or measurement. This is often referred to as the "pre-existing universe" hypothesis.
In this view, every possible outcome of every event exists in a separate universe, and the act of observation or measurement simply selects which universe we experience. This means that the branches of reality are not created by us, but rather, they are already present in the multiverse, waiting to be accessed.
Think of it like a vast, cosmic library, where every possible book (or universe) already exists on the shelves. When you travel back in time, you're simply selecting a different book from the shelf, rather than creating a new one.
This idea is often linked to the concept of eternalism, which suggests that all moments in time, past, present, and future, exist simultaneously and are equally real. According to eternalism, the universe is a four-dimensional tapestry, where every moment in time is a separate thread, and every thread already exists.
In this context, time travel is more like navigating the existing threads, rather than creating new ones. You're simply moving through the pre-existing multiverse, exploring different branches and experiencing different outcomes.
However, some theories, such as the "participatory multiverse" hypothesis, suggest that the act of observation or measurement can actually create new branches of reality. This would mean that the branches of reality are not pre-existing, but rather, are created by the act of observation itself.
What are your thoughts on this? Do you think the branches of reality already exist, waiting to be accessed, or are they created by the act of observation or measurement?