Re: Everything you wanted to know about physics...
On 18 Nov 2013, at 00:53, LizR wrote: If the universe exists for long enough It has to be virtually infinite, have special homogeneity conditions, and even in that case, I don't see how a Boltzman brain can exist a sufficiently long time to get the deep and linear comp state capable of explaining our observation. Even if by chance a BB emulate a Universal Dovetailer, you will need infinite constraints and large period of time, to get states influencing the FPI. they appear to be inevitable. No doubt that leads to some sort of Bayesian argument about the universe not being able to last too long, or we'd all be BBs (too long would be an awfully long time, to misquote Peter Pan). However, can we be sure we aren't? Maybe comp has something to say about this... :) But people invoking the BBs are not aware of the FPI. If BB exists (and run long enough), we are emulated by them, and the physical laws are given by the statistics on the computations run by them, and run in arithmetic. Now, in arithmetic, there is an infinty of BBs, and an infinity of emulation of ourselves, and the BB does not play any special role. BBs are just a a variant of "brain in a vat". With comp, they don't make sense other than the trivial sense that arithmetic contains all BBs, all brains in a vat, but eventually the "matter" of those emulators is themselves an "hallucination" stable by the global FPI (the FPi on the whole arithmetic). This makes BBs sorts of physicalist ill defined notion: their presence of absence does not change anything more than the existence of brains, aliens, etc. Primitive material physical emulators , be them brain or Boltzman brain, simply don't exist. They emerge from *all* computations which exists in arithmetic. Bruno On 18 November 2013 03:23, wrote: I think K. Susskind, is, or was a supporter of Boltzmann Brains, which is a wild, subject, if true. -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out. http://iridia.ulb.ac.be/~marchal/ -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: Everything you wanted to know about physics...
If the universe exists for long enough they appear to be inevitable. No doubt that leads to some sort of Bayesian argument about the universe not being able to last too long, or we'd all be BBs (too long would be an awfully long time, to misquote Peter Pan). However, can we be sure we aren't? Maybe comp has something to say about this... :) On 18 November 2013 03:23, wrote: > I think K. Susskind, is, or was a supporter of Boltzmann Brains, which is > a wild, subject, if true. > > -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: Everything you wanted to know about physics...
I think K. Susskind, is, or was a supporter of Boltzmann Brains, which is a wild, subject, if true. -Original Message- From: LizR To: everything-list Sent: Sat, Nov 16, 2013 6:41 pm Subject: Everything you wanted to know about physics... ...but were afraid to ask. http://www.openculture.com/2013/05/leonard_susskind_teaches_you_the_theoretical_minimum.html -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out. -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Everything you wanted to know about physics...
...but were afraid to ask. http://www.openculture.com/2013/05/leonard_susskind_teaches_you_the_theoretical_minimum.html -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
