I recall Bruce giving an example of an irreversible process, but I can't recall the details. AG
On Thursday, August 4, 2022 at 6:39:04 AM UTC-6 Jason wrote: > 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/1c5ab1b8-fef6-4a5c-bd88-fb7b24d0e4b8n%40googlegroups.com.
