On Thu, Aug 4, 2022, 5:23 AM Alan Grayson <[email protected]> wrote: > I meant to write that information conservation depends on reversibility! How solid is that assumption? AG
I think it is pretty good. I think reversibility is part of it. Certainly in a reversable Newtonian kind of physics (no GR and no QM, full determinism), reversability would imply an inability to destroy information. In reversible computers, information can't be deleted, only shuffled around, so in this simplistic model, reversibility (in a Turing machine) implies conservation of information. In GR, matter falling into black holes was originally thought to be an irreversible process. This led to the "black hole war". https://en.wikipedia.org/wiki/The_Black_Hole_War which was eventually settled by concluding information isn't destroyed in a black hole, therefore the pattern of black hole radiation must somehow indicate or encode what has fallen in to it. In QM, wave function collapse was thought to be an example of an irreversible process. Yet from the global view of all the branches and many world's it is not. But moreover, despite the apparent irreversibility if collapse from the confines of any one branch, the information available within any single branch still seems to be conserved (just as matter and energy are). This lead to a kind of: energy-matter-information equivalence. https://en.wikipedia.org/wiki/Holographic_principle#Energy,_matter,_and_information_equivalence This question, I think, probes at the very deepest levels of physics. I have some more thoughts on this written here: https://alwaysasking.com/why-does-anything-exist/#Information_as_Fundamental Jason -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CA%2BBCJUi68OYPocr01uFZAB9hhyS%3DOYZV_gDtx%3DBF%3D2FbtTGz%3DA%40mail.gmail.com.
