Past Hypothesis Taxonomy

Let me try an experiment: using a blog post to develop a taxonomy.  Here I'll try to develop a list/taxonomy of (at least semi-coherent) answers to the question I posed yesterday: why is it harder to formally predict pasts, versus futures (from presents)? Mostly these are explanations of the "past hypothesis", but I'm trying to stay open-minded toward a wide range of explanations.

I'll start with a list of answers, and then add more and group them as I read comments, think, etc.  I'll feel free to edit the post from here on:

  • Extremely unlikely:
    • Reality isn't different; we just ask different future vs. past questions.
    • An outside "God" intervened to make our past different.
    • We live after a big local ebb (i.e., fluctuation) in matter.
  • Rather unlikely:
    • Quantum measurement has a local time asymmetry that makes big effects.
    • A weak local time asymmetry in matter accumulates to big effects.
    • A past ebb in spacetime shape (e.g., inflation) forced a big matter ebb.
    • All spacetime boundaries satisfy a law-like "low entropy" condition.
  • Unlikely:
    • Our expanding cosmos violates one-to-one state mappings across time.
    • Past and future have different spacetime law-like boundary conditions.
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