I just send a posting to the FOR list about my article. I did not have the time to reply to everyone on this list previously. Reading the old discussion again, I think that it was suggested that the exact quantum states matter, but they don't. It was only used to illustrate the thought experiment by Deutsch which would allow one to prove that the MWI is correct.
This is what I sent to the FOR list: Some time ago I wrote a small article: http://arxiv.org/abs/0902.3825 This was recently featured in New Scientist: http://www.newscientist.com/article/mg20227044.200-avoid-a-future-cataclysm-forget-the-past.html The idea is that an observer can undo things that have already happened by resetting its memory, because when you reset your memory to a previous state, that previous state you are evolving into will be the same in a sector of the multiverse which evolved from that previous state and then was reset for any reason. So, if the reseting is triggered for reason A or reason B, it would lead to the observer ending up in the same state. The outcome of a new measuremnt to find out why the mempory was reset is then not pre-determined. Some details: The word "state" here refers to the classically describable state of an observer. In the article, I focus on machine observers. The subjective state of the observer is then exactly specified by specifying the ones and zeroes of the bits of the memory. So, I assume that whatever the observer can be aware of is encoded by the classical state of the bits of the computer and not the exact quantum state of the computer. The exact state of the computer has to be specified using a wavefunction of the computer (in fact, the state of the computer will be entangled with the rest of the universe). Then, one can write down any generic quantum state of the universe containing the observer by supplementing the (classical) information stored in the bits by the extra information you need to fully specify the wavefunction of the computer and everything else in the universe. One can then consider the unitary transformations that would represent a memory backup, memory resetting etc. After the memory resetting, you are notified why the memory was reset. Since the relevant things happen in the realm where classical physics applies, the probabilities are the same as what you would find using purely classical reasoning. The interpretation of these probablilites is, however, different from classical physics. When the memory is reset, you evolve to some state while the rest of the inverse will be in some superposition of states in which the memory was reset for various reasons. Then, before finding out why the memory was reset, the outcome of that observation is not pre-determined --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to email@example.com To unsubscribe from this group, send email to everything-list+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/everything-list?hl=en -~----------~----~----~----~------~----~------~--~---