tag:blogger.com,1999:blog-5418994588621362010.post3210434899436824987..comments2023-11-15T10:08:56.796-08:00Comments on the blog formerly known as The Statistical Mechanic: too many worldsWolfganghttp://www.blogger.com/profile/07086991199438418163noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5418994588621362010.post-47456680962249013172012-04-30T02:19:11.544-07:002012-04-30T02:19:11.544-07:00Perhaps I should point out that <H|F> = <...Perhaps I should point out that <br><H|F> = <H|H> + <H|N> + <H|x1> + <H|x2> + ...<br>is not some abstract quantity.<br>It determines the probability that we find a happy cat in the state |F>.<br><br>In other words, if the x terms overwhelm the sum it means that m.w.i. does not get probabilities right (of course we kind of knew that already 8-)wolfgangnoreply@blogger.comtag:blogger.com,1999:blog-5418994588621362010.post-31951174864091096152012-04-30T02:06:59.543-07:002012-04-30T02:06:59.543-07:00>> If the universe began in a well defined s...>> If the universe began in a well defined state<br><br>Susskind and Vilenkin debate right now if the universe is eternal or had a beginning. In any case, <a href="http://tsm2.blogspot.com/2011/10/harmonic-universe.html" rel="nofollow">the normalization of the wavefunction of the universe</a> is not a trivial matter...<br><br>But if you assume that the wavefunction of the universe is normalizable, it is still obvious that only a tiny bit of this wavefunction is associated with our branch(es) and the vast majority is about other worlds. And we dont know much about this vast majority and we dont even know the amplitudes in it. <br>(The |I> state could come with a tiny weight for all we know!)<br><br>Therefore we cannot know how the sum over those other branches converges and how it compares to the few parts interesting to us imho.<br><br>If we consider Erwin's cat and do a real calculation we need to ignore all the other worlds - i.e. we need to collapse the wave function of the universe.wolfgangnoreply@blogger.comtag:blogger.com,1999:blog-5418994588621362010.post-30892403347798947822012-04-30T01:40:41.148-07:002012-04-30T01:40:41.148-07:00If the universe began in a well defined state then...If the universe began in a well defined state then the wave function will remain normalizable independent of the evolution into different branches. Where is the problem?Anonymousnoreply@blogger.com