On 11/6/2013 2:46 PM, LizR wrote:
On 7 November 2013 11:31, meekerdb <meeke...@verizon.net <mailto:meeke...@verizon.net>> wrote:

    On 11/6/2013 2:09 PM, LizR wrote:

        That's similar to my pet theory for explaining the Beckenstein bound -
        information capacity only goes up as volume in the multiverse.

    The volume of the multiverse is generally thought to be infinite. Even the 
volume of
    our universe may be infinite.  If you want to apply the Beckenstein bound, 
    the observable universe since its boundary forms an horizon relative to us.

Yes. The BB has to be applied to a finite volume. Indeed it seems ridiculous, intuitively - the volume of the universe is quite likely infinite, so we can apply the BB on larger and larger scales for as long as we like (in theory) - and if we do so, we will presumably find that we reach a point where the information content we derive for the interior of that volume is insufficient to account for its contents. (Or does something always prevent that happening in practice - is this the point at which we reach a "cosmic horizon" ? Does the BB have an "information protection conjecture" that makes the universe safe for information theoreticians?)

If you estimate the entropy of the visible universe (i.e. our Hubble volume) as being the Beckenstein bound it comes out the right order of magnitude corresponding to an estimate from particle physics.



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