There is also type 3, called a closed timelike curve or Lorenzian manifold. Aka a Djinn: a loop in causality where the original cause depends on the final effect. It exists outside of linear time and yet is not a separate timeline or “-verse” in the multiverse.
A singleton universe doesn’t allow for multiple versions of a single moment to coexist. A closed timelike curve does, and potentially an infinite number of variations all as long as they are continuous in the same curve. It’s also different from a proper many worlds theory with quantum variations. The relationship between causes and effects are mapped differently. Thus it’s its own thing.
There is also type 3, called a closed timelike curve or Lorenzian manifold. Aka a Djinn: a loop in causality where the original cause depends on the final effect. It exists outside of linear time and yet is not a separate timeline or “-verse” in the multiverse.
That’s a variation of a singleton universe timeline.
A singleton universe doesn’t allow for multiple versions of a single moment to coexist. A closed timelike curve does, and potentially an infinite number of variations all as long as they are continuous in the same curve. It’s also different from a proper many worlds theory with quantum variations. The relationship between causes and effects are mapped differently. Thus it’s its own thing.