On Mon, Jul 12, 2021 at 12:44 PM smitra <[email protected]> wrote: > On 12-07-2021 00:43, Bruce Kellett wrote: > > > > You can't decide to put mirrors in place after the photons have > been emitted. > > Of course, you could always decide in advance to perform all > > experiments in reflecting boxes, but that is not what is done in > > practice. So the general rule is that escaping photons are not > > recoverable. > > If in one experiment with mirrors they are recoverable and therefore > interference can be detected in principle, then that proves that the > other sectors do objectively exist. Since the objective existence of > these sectors does not depend on whether or not one uses mirrors in the > experiment, one can conclude that they exist in general. >
The point of measurement is to get a definite permanent result. Escaping photons (IR or other) are secondary to this endeavour. They just represent one universal way in which information can escape from an experiment and contribute to the overall decoherence. If you recover all these photons, and reverse all other records of the particular experimental result, then you have effectively not made a measurement. Measurement being defined by the formation of permanent records of a result. If there are no such records, then no measurement has been made. That may well be the case. But that does not demonstrate the objective existence of other sectors, or other worlds in which different results were obtained. There was no measurement in that case, so no results were obtained anywhere. Showing that some particular experiment is (or was) reversible, does not actually prove anything other than that the laws of physics are reversible. Which we knew anyway, and is not relevant for measurement. 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/CAFxXSLRfejJ1rme7Ch_z9%3DCOVTuUPDgRtX3DG66Y4YSp945SCw%40mail.gmail.com.
