http://motls.blogspot.co.uk/2011/05/bousso-susskind-hypermultiverse.html

The Bousso-Susskind hypermultiverse Leonard Susskind and Raphael Bousso are creative guys and famous physicists. Both of them are well-known for some papers about holography, too. Of course, the first scientist is still a bit more famous. They have just released a preprint to show that they're on crack and they are greatly enjoying it:

http://arxiv.org/abs/1105.3796

The Multiverse Interpretation of Quantum MechanicsThe ordinary multiverse with its infinitely many bubbles whose possible vacuum states are located in 10^{500} different stationary points of the stringy configuration space was way too small for them. So they invented a better and bigger multiverse, one that unifies the "inflationary multiverse", the "quantum multiverse", and the "holographic multiverse" from Brian Greene's newest popular book,

Yes, their very first bold statement is that parallel universes in an inflating universe are the same thing as Everett's many worlds in quantum mechanics! ;-)

Sorry to say but the paper looks like the authors want to stand next to Lee Smolin whose recent paper - as much crackpottish as any paper he has written in his life so far - is about "a real ensemble interpretation" of quantum mechanics. Bousso and Susskind don't cite Smolin - but maybe they should! And in their next paper, they should acknowledge me for pointing out an equally sensible and similar paper by Smolin to them. ;-)

Just like your humble correspondent would always emphasize that the "many worlds" in Everett's interpretation of quantum mechanics are completely different "parallel worlds" than those in eternal inflation or those in the braneworlds, these famous physicists say - On the contrary, they're the same thing!

However, at least after a quick review of the paper, the drugs seem to be the only tool that you can find in the paper or in between its lines to convince you that it's the case. ;-)

It's a modern paper involving conceptual issues of quantum mechanics, so it treats decoherence as the main mechanism to address many questions that used to be considered puzzles. Good. However, everything that they actually say about decoherence is a little bit wrong, so their attempts to combine those new "insights" with similar "insights" resulting from similar misunderstandings of the multiverse - and especially the way how outcomes of measurements should be statistically treated in a multiverse - inevitably end up being double gibberish that is cooked from two totally unrelated components such as stinky fish and rotten strawberries.

The Bousso-Susskind hypermultiverse Leonard Susskind and Raphael Bousso are creative guys and famous physicists. Both of them are well-known for some papers about holography, too. Of course, the first scientist is still a bit more famous. They have just released a preprint to show that they're on crack and they are greatly enjoying it:

http://arxiv.org/abs/1105.3796

The Multiverse Interpretation of Quantum MechanicsThe ordinary multiverse with its infinitely many bubbles whose possible vacuum states are located in 10^{500} different stationary points of the stringy configuration space was way too small for them. So they invented a better and bigger multiverse, one that unifies the "inflationary multiverse", the "quantum multiverse", and the "holographic multiverse" from Brian Greene's newest popular book,

*The Hidden Reality*.Yes, their very first bold statement is that parallel universes in an inflating universe are the same thing as Everett's many worlds in quantum mechanics! ;-)

Sorry to say but the paper looks like the authors want to stand next to Lee Smolin whose recent paper - as much crackpottish as any paper he has written in his life so far - is about "a real ensemble interpretation" of quantum mechanics. Bousso and Susskind don't cite Smolin - but maybe they should! And in their next paper, they should acknowledge me for pointing out an equally sensible and similar paper by Smolin to them. ;-)

Just like your humble correspondent would always emphasize that the "many worlds" in Everett's interpretation of quantum mechanics are completely different "parallel worlds" than those in eternal inflation or those in the braneworlds, these famous physicists say - On the contrary, they're the same thing!

However, at least after a quick review of the paper, the drugs seem to be the only tool that you can find in the paper or in between its lines to convince you that it's the case. ;-)

It's a modern paper involving conceptual issues of quantum mechanics, so it treats decoherence as the main mechanism to address many questions that used to be considered puzzles. Good. However, everything that they actually say about decoherence is a little bit wrong, so their attempts to combine those new "insights" with similar "insights" resulting from similar misunderstandings of the multiverse - and especially the way how outcomes of measurements should be statistically treated in a multiverse - inevitably end up being double gibberish that is cooked from two totally unrelated components such as stinky fish and rotten strawberries.