Roger Penrose had proposed a rival to Everett's Many Worlds as an Interpretation of Quantum Mechanics. In his Idea the Quantum Wave Function really does physically collapse and timing of the collapse depends on a random element and on gravity and thus on the mass density of particles in superposition; the more massive the object the shorter the time before the wave collapses and Penrose said that was the reason our everyday macro world appears to follow classical physics to an excellent approximation. However in the September 7 2020 issue of the journal Nature Physics there is a report of an experiment done in a laboratory deep under the GranSasso Mountain in Italy that produced results that are NOT compatible with Penrose's theory.
Underground test of gravity-related wave function collapse <https://www.nature.com/articles/s41567-020-1008-4> Test of wave function collapse suggests gravity is not the answer <https://phys.org/news/2020-09-function-collapse-gravity.html> John K Clark -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv13f5fMhs2f3XoPsnhze4nRQeRhqq_GjCDTnwCO8FLsJg%40mail.gmail.com.
