Thank you @structureoftruth for taking the time to write this post.
I have a some followup questions on this that perhaps are already addressed in your blog:
- Aside from the “what is now” question, which is interesting by itself, is there a larger philosophical context to whether someone is an A or B theorist? By this I mean: are there philosophical arguments that has in its axioms the A or B theory? And are there philosophical positions (perhaps something that is still popular today, unlike logical positivism) that implies the A or B theory?
- How does the A and B theory relate to the block/growing block Universe and presentism/eternalism? To someone who does not follow philosophy, they all seem very similar.
- I think I understand the position of B theorists - they believe that the entire spacetime is ontologically real. However, what exactly do A theorists believe to be ontologically real/not real? Do they not believe that spacetime is real, and only a spacelike slice of it is real?