On Mon, Jul 12, 2021 at 1:48 PM 'Brent Meeker' via Everything List < [email protected]> wrote:
> On 7/11/2021 7:57 PM, smitra wrote: > > > It's a correct statement, see https://doi.org/10.1071/AS03040 page 101 > section 3.3: > > "The most distant objects that we can see > now were outside the Hubble sphere when their comoving > coordinates intersected our past light cone. Thus, they > were receding superluminally when they emitted the photons > we see now. Since their worldlines have always been > beyond the Hubble sphere these objects were, are, and > always have been, receding from us faster than the speed > of light.3" > > > Interesting. I shall read it carefully. But it doesn't affect the point > that in the Bucky Ball double slit experiment the photons can either hit > the walls or escape to infinity and in either case the interference pattern > will be washed out. Even your citation says, > > *"No observer ever overtakes a light beam and all observers measure light > locally to be travelling at c." *Brent > The situation is confusing because the Hubble radius expands with time, so objects (and light) that were once beyond the Hubble horizon can enter it and be seen now. I think the important point is "The particle horizon can be larger than the event horizon, although we cannot see events that occur beyond our current event horizon, we can still see many galaxies that are beyond our current event horizon by light they emitted long ago." This does not alter the fact that light that we emit now and that passes out beyond our Hubble horizon is lost from us forever. And events that now occur beyond our Hubble horizon are forever hidden from us. In other words, the photons escaping in the buckyball experiment are lost beyond possibility of recovery. So the which-way information they carry still exists somewhere, and the interference is washed out, as Brent says. 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/CAFxXSLSZ9m8qUha%3De4u_J4jTKMya0E7YOcTdK%3DeuFn%2BJjt%3DfDw%40mail.gmail.com.
