On 5/24/2011 10:04 AM, Stephen Paul King wrote:
Hi Brent,
*From:* meekerdb <mailto:meeke...@verizon.net>
*Sent:* Tuesday, May 24, 2011 12:53 PM
*To:* everything-list@googlegroups.com
<mailto:everything-list@googlegroups.com>
*Subject:* Re: MULTIVERSE HYPOTHESIS and natural laws
On 5/24/2011 7:26 AM, Stephen Paul King wrote:
-----Original Message-----
From: ronaldheld
Sent: Tuesday, May 24, 2011 7:58 AM
To: Everything List
Subject: MULTIVERSE HYPOTHESIS and natural laws
http://arxiv.org/ftp/arxiv/papers/1105/1105.4278.pdf
They mentioned Tegmark's Level IV multiverse so I thought i would post
the link here.
Ronald
--
Hi Ronald,
Nice paper! I would like to read Vic Stenger's comment on it as
he has argued against the fine tuning problem.
http://www.colorado.edu/philosophy/vstenger/Fallacy/FTCosmo.pdf
Onward!
Stephen
Buy the book. Vic discusses all those purported instance of
fine-tuning. However, he accepts that multiple universes would serve
to explain fine-tuning; he just doesn't think they're necessary. Or
looked at another way, if there are multiple universes, ones with life
are not particularly rare.
Brent
--
[SPK]
I have read the associated paper (from Vic’s website) which
contains the essence of the book. I think that the Gil and Alfonseca
paper (referenced above) point of that things are not as simple as Vic
would like. Their modeling using cellular automata gives a reasonable
approximation to empirical experimental testing of the fine tuning
hypothesis within the many worlds hypothesis. They conclude that “the
results presented in this paper can be considered as an inkling that
the hypothesis of the multiverse, whatever its type, does not offer an
adequate explanation for the peculiarities of the physical laws in our
world”. The White Rabbits and measure problem are still very much alive!
Onward!
Stephen
They seem determined to find fine-tuning:
"To see that this is so, let us look at a concrete example: the cosmic
landscape of
string theory may contain about 101000 structurally different universes,
but they share
common features, such as this: all of them possess physical laws of the
quantum type.
None of these universes may be ruled, for instance, by a Newtonian
physics structure. This
is an interesting detail, as the huge importance of quantum effects for
the appearance of
the chemical structures basic for life makes us suspect that, if the
multiverse contained only
worlds based on variations of classical physics, not one of them would
be apt for the
existence of life. Therefore, whatever the enormous size of the
superstring cosmic
landscape, it is still a biophile scenario which suggests design, in
contrast with the
unrealized possibilities of completely sterile multiverses."
So if physicist come up with a theory that explains all the parameter
values, they will say, "The theory is a fine-tuned choice among many
theories, almost all of which do not explain the parameters." If
physicist come up with a theory showing that a wide range of parameters
and theories produce life friendly universes, they will say, "Yes, but
among all the infinitely many possible parameter sets and theories this
one is of measure zero." If physicist come up with a theory that
*every* universe is life friendly, they will say, "What clever design to
make all universes life friendly."
Brent
"A theory that will explain anything fails to explain at all.
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