On 9/26/2019 11:41 PM, Philip Thrift wrote:
On Thursday, September 26, 2019 at 7:01:19 PM UTC-5, Lawrence Crowell
wrote:
On Wednesday, September 25, 2019 at 6:54:59 AM UTC-5, John Clark
wrote:
It seems that nearly everyone on the list has a strong opinion
about Sean Carroll's new book, but has anyone other than me
actually read it?
John K Clark
I have not read his book, but I have read his papers and the one
he coauthored with Sebbens. I know what he has done. I am
definitely agnostic about MWI as I am with all interpretations.
Carroll and Sebens has though opened the door to a relationship
between the Born rule and MWI, and I suspect quantum
interpretations in general. Now that is something I find
potentially very interesting.
LC
See if Sean Carroll answers the question of "weighing" worlds:
*How much is too Many Worlds, is it just right?*
https://groups.google.com/d/msg/everything-list/E3WLUdnW8jI/MLPg3dAhAgAJ
Suppose world W branches (in reality, not in "bookkeeping") to worlds
W0 and W1.
If reality is pure information (basically purely mathematical bits of
0s and 1s), then that sort of "production" seems OK.
But what if W is (or contains) matter. Based on matter contents of W,
W0, and W1:
*If the matter contents of W0 plus W1 combined is greater than the
matter content of W, **how was the extra matter "produced"?*
Two answers so far:
1. /If an infinity of indiscernible universes already exist at the
start and are only differentiating/diverging (instead of splitting),
then no matter is created, all of it was already there./
2. /Differentiation rather that duplication of matter is one
possibility, but duplication of matter is not logically impossible
either. Empirically, we have that matter cannot be created, but that
is within a single world./
The "new" matter (and energy and space and information) are discounted
by the probability of their existence. It seems curious to me that the
MWI advocates want to take the wave function ontologically but not the
Hilbert space. From the viewpoint of Hilbert space all the different
"worlds" are just subspaces on which the wave-function of the multiverse
can be projected. A world "splitting" is just the unfolding of a world
into two orthogonal subspaces.
Brent
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