On 11/27/2017 6:14 PM, Russell Standish wrote:
On Mon, Nov 27, 2017 at 05:09:13PM -0800, Brent Meeker wrote:
On 11/27/2017 4:17 PM, Russell Standish wrote:
On Mon, Nov 27, 2017 at 03:57:37PM -0500, John Clark wrote:
<agrays...@gmail.com> wrote:
>
Your source is fact-challenged. Weinberg thinks MULTIVERSE may have merit,
but NOT the MWI,
Then give me some facts! Where does Weinberg say that? And how can you
have a multiverse without many worlds or many worlds without a multiverse?
Alan deliberately uses the term "Multiverse" to refer to the string
landscape. Note this usage contravenes the usage of Multiverse by
everybody else here, which normally is as David Deutsch originally intended by
the term, the multiple universes of the MWI, or sometimes even more
generally as any of the Tegmarkian ensembles.
I think we should use "multiverse" to refer to the cosmological multiplicity
per Tegmark and use "multiple worlds" to refer to the quantum multiplicity
of Everett (so it's consistent with the abbreviation MWI).
Tegmark uses "multiverse" to refer to any of his parallel universe
classes, including the many worlds. This wikipedia article also takes
the same view https://en.wikipedia.org/wiki/Multiverse
In my book, I use Multiverse consistently to refer to the quantum many
worlds, following David Deutsch, who I believe(d) introduced the term, and
Plenitude to refer to Tegmark's level 4. I don't have nicknames for
the other two Tegmarkian "multiverses".
PS - according to Wikipedia, the actual term was coined by William
James in 1895!
It is just terminology, and terminology should be allowed to evolve,
just so long as everybody is clear about what is being discussed. I
appreciate that it appears these days that multiverse can refer to any parallel
universe theory, a la Tegmark, so that's how we should be using it,
and qualify (eg quantum multiverse) where needed.
It's shorter and clearer to MWI for Everett/Deutsch multiplicity.
Brent
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