To compute a consistent universe with a low-entropy terminal condition and high-entropy initial condition, you have to simulate lots and lots of universes, then throw away all but a tiny fraction of them that end up with low entropy at the end.
Look at your explanation of entropy again, Eliezer. It’s an expression of the multiplicity of equivalent-as-far-as-you-can-tell states. So, if you know you’re going to have a low-entropy final state, then the entropy of the initial state has to be that low already in the beginning.
I guess that means you don’t know that it’s going to end up low entropy; most universes don’t end up low-entropy, so you expect this one won’t as well.
Based on what information? If I compute a state that will evolve into a low entropy state and then forget that information about it and base my calculation of entropy on its temperature, pressure etc. then I’ll have a high entropy state that evolves into a low entropy one. Indeed “entropy (based on some macro-scale parameters)” seems to be what people mean when they say “entropy”.
Look at your explanation of entropy again, Eliezer. It’s an expression of the multiplicity of equivalent-as-far-as-you-can-tell states. So, if you know you’re going to have a low-entropy final state, then the entropy of the initial state has to be that low already in the beginning.
I guess that means you don’t know that it’s going to end up low entropy; most universes don’t end up low-entropy, so you expect this one won’t as well.
Based on what information? If I compute a state that will evolve into a low entropy state and then forget that information about it and base my calculation of entropy on its temperature, pressure etc. then I’ll have a high entropy state that evolves into a low entropy one. Indeed “entropy (based on some macro-scale parameters)” seems to be what people mean when they say “entropy”.