On 3/7/2020 7:38 PM, Alan Grayson wrote:
On Saturday, March 7, 2020 at 6:33:05 PM UTC-7, Brent wrote: On 3/7/2020 4:54 PM, Bruce Kellett wrote:On Sun, Mar 8, 2020 at 11:25 AM Alan Grayson <[email protected] <javascript:>> wrote: On Friday, March 6, 2020 at 1:22:30 PM UTC-7, Philip Thrift wrote: Sean Carroll @seanmcarroll · What really happens to Schrödinger’s cat is that it becomes entangled with its environment, so that the wave function comes to describe multiple almost-classical worlds! Happens to all of us, and nicely explained in this @veritasium video. https://twitter.com/seanmcarroll/status/1235999175428333568 <https://twitter.com/seanmcarroll/status/1235999175428333568> @philipthrift I've asked this before and might have gotten some replies, but I can't recall what they were. Many of the quantum paradoxes arise due to a particular interpretation of superposition, namely, that all alternatives happen simultaneously (before measurement). Why can't superposition be interpreted to mean that each alternative has a probability of occurrence and nothing more? TIA, AG In a collapse or an epistemic interpretation, that is exactly what it means.The problem is saying exactly when the Schroedinger equation stops describing the evolution and the alternative happens, i.e. the wf collapses. In QBism it's when you learn the result and you update your knowledge. In the Transactional interpretation it's when an interaction is realized. I think Zurek's quantum Darwinism could be given this interpretation: when the cross terms in the pointer basis become sufficiently small. BrentI think the Transactional Interpretation has additional problems, such as forward (or backward?) in time signaling.
Ruth Kastner has tried to fix that by postulating a possibility space where the offer wave elicits the answer wave; so it's not in spacetime.
Does a comparable problem arise when using Heisenberg's formulation of QM? AG
Matrix mechanics is equivalent to Schoedinger's equation, so I think it has the same problem of having an evolution phase and a measurement phase.
Brent -- 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/c60275da-93a4-4060-f718-97871d3ebf8d%40verizon.net.
