On Fri, Oct 16, 2020 at 10:07:32AM +1100, Bruce Kellett wrote: > > It is refuted by the idea of unitary evolution in QM. Unitary evolution means > that everything is reversible, If new microstates are created as the universe > expands, then this expansion cannot be reversed: the creation of such > microstates gives an absolute arrow of time. This is generally rejected, > because physicists tend to believe in unitary dynamics. If dynamics are not > unitary, then the universe is not governed by the Schrodinger equation, and > arguments for the multiverse collapse.
I'm not sure the last point follows, perhaps you can expand on it. But it is an interesting argument that the Layzer style "increase in microstates" should be enough to prevent a Hawking style "wavefunction of the universe". Could the ideas be made compatible by have the number of accessible microstates increasing over time, due to the expansion of the universe, but that the total number remains constant, or is even infinite? Or does that place us right back at the original problem of having a low entropy initial state. -- ---------------------------------------------------------------------------- Dr Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders [email protected] http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- 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/20201016043814.GA4042%40zen.
