On Wed, Oct 26, 2022 at 10:15 AM smitra <[email protected]> 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLQXBFdX%2BAWENJg7%2B_PFG%2BK5w370ZCrJN20wU96uV4VVzA%40mail.gmail.com.
