On Wed, Oct 26, 2022 at 10:15 AM smitra <smi...@zonnet.nl> wrote: > On 26-10-2022 00:14, Bruce Kellett wrote: > > There is no such thing as irreversible decoherence in unitary QM. Now, > you and Brent have invoked the expansion of the universe in past > discussions to argue that fundamentally irreversible phenomena do exist. > However this reasoning is flawed, because you then assume a > semi-classical model where the expansion of the universe is described in > a classical way. If QM is fundamental, then the entire state of the > universe, including the space-time geometry is part of that quantum > description. You then have a wavefunctional that assigns a complex > amplitude to the entire state of the universe that includes al the > fields of all particles and also the space-time geometry. > > > Thing is that the laws of physics are what they are. You cannot demand > that you require measurement results to be truly permanent and that they > therefore arise due to irreversible processes. Whether that's the case > or not is determined by the laws of physics, not by us. >
The laws of physics tell us that measurements are irreversible. Unitary evolution is universal only in your imagination. Many Worlds is an interpretation, not an established fact. Bruce -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLQXBFdX%2BAWENJg7%2B_PFG%2BK5w370ZCrJN20wU96uV4VVzA%40mail.gmail.com.
