On Tue, Nov 28, 2017 at 10:59 PM, Bruce Kellett <[email protected]> wrote:
> > > >> I see no reason all the Everett worlds have the same physics, > > > > > Everettian worlds follow from assuming that the Schrödinger equation > applies everywhere without exception, so that all physical evolution is > unitary. A change in the underlying physics -- such as a change in the > value of fundamental constants, Planck's constant or Newton's constant for > example -- would not be unitary, so cannot occur in MWI. > Why can't it be unitary?? Show me why if Newton's constant had any value other than 6.754* 10^-11 m3 kg^−1 s^−2 the sum of all quantum probabilities would no longer add up to exactly 1. If you can really do that then you've just derived Newton's constant directly from first principles and you should but a ticket to Stockholm right now because you're absolutely certain to win the next nobel Prize. >> >> lets assume you're right, then the string theory multiverse must be >> larger than the many worlds multiverse incorporating everything in >> Everett's version and MORE; after all if it contains universes with >> radically different laws of physics it must also contain more modest things >> like a world where my coin came up heads instead of tails. > > > > > I would suggest that there is no such world. Whether a coin comes up head > or tails on a simple toss is not a quantum event; > Do you actually think reality can be neatly divided between quantum and non-quantum events? A unstable atom has a 50% chance of decaying and producing a easily detectable high speed electron, if the electron is detected a computer controlled robot arm turns my coin to heads, if it detects no electron it turns my coin to tails. > > > Also, in the Level I multiverse it is quite unlikely that the initial > conditions could differ to an extent such that everything was identical in > the two worlds up to your coin toss. > Quite unlikely events are going to happen if the number of universes is large enough, and if there are a infinity of worlds then anything with a non-zero probability is certain to happen in some universe. > > > Worlds are not random objects, they follow the laws of physics, so given > some initial conditions, the future is determined in a deterministic > Everettian MW scenario. It is not the case that everything logically > possible happens -- only those things that follow from the initial > conditions > But there is not just one initial condition, there are as many initial condition s as there are universes. > > > the laws of physics cannot be broken. Yes but what are the true laws of physics? Kepler thought that the fact there were 7 and only 7 planets was a law of physics that could be derived from pure mathematics. He was wrong. We may be as wrong as Kepler about some of our laws. 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
