Placement of "Level III" Universe in Tegmark's Classification
"'Lee Corbin' [email protected] [Fabric-of-Reality]" <[email protected]> Tue, 13 Jan 2015 21:21:15 -0800
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Hi David,
The =E2=80=9Clevels=E2=80=9D nomenclature Tegmark uses implies n=
esting.
That is, our infinite Level I universe is but *one* of all the leve=
l II =E2=80=9Cbubbles=E2=80=9D.
(I don=E2=80=99t have any problem with that=
: if any kind of eternal inflation implies other universes besides ours, th=
en fine.)
But to then call the MWI branching =E2=80=9CLevel III=E2=80=9D i=
mplies that the whole level II universe, bubbles and all, branch coherently=
MWI style.
What you you think of that? Myself, I suspect that the =E2=80=
=9CLevel III=E2=80=9D multiverse branching=E2=80=94Everett branching=E2=80=
=94most cleanly applies to a single Level I infinite universe. In other wor=
ds, while our own =E2=80=9Cbubble=E2=80=9D splits and recombines continuous=
ly in terms of the ordinary MWI branching of each of its constituent system=
s, extending this somehow to a whole set of =E2=80=9Cbubbles=E2=80=9D is no=
t clear and probably problematic.
I=E2=80=99m even worried about what seem=
s to be some cosmologists willing use of the time parameter =E2=80=9Ct=E2=
=80=9D as somehow *simultaneously* applicable across more than just one bub=
ble universe! I mean, it=E2=80=99s even a stretch (though one that is coher=
ent and which I accept) to identify far away galaxies in our universe whose=
inhabitants find themselves also at 13.8 AB (After Bang) as experiencing t=
he same =E2=80=9Cnow=E2=80=9D that we do. But even this identification shou=
ld have only limited utility (I would think). To then carry it further outs=
ide our Level I infinite universe appears to me to border on being incohere=
nt.
I would love to hear any comments you have about any of this.
Thanks,
=
Lee
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<DIV>Hi David,</DIV>
<DIV> </DIV>
<DIV>The =E2=80=9Clevels=E2=80=9D nomenclature Tegmark uses implies nesting=
.</DIV>
<DIV>That is, our infinite Level I universe is but *one* of all the level I=
I=20
=E2=80=9Cbubbles=E2=80=9D.</DIV>
<DIV>(I don=E2=80=99t have any problem with that: if any kind of eternal in=
flation=20
implies other universes besides ours, then fine.)</DIV>
<DIV>But to then call the MWI branching =E2=80=9CLevel III=E2=80=9D i=
mplies that the whole=20
level II universe, bubbles and all, branch coherently MWI style.</DIV>
<DIV> </DIV>
<DIV>What you you think of that? Myself, I suspect that the =E2=80=9CLevel =
III=E2=80=9D=20
multiverse branching=E2=80=94Everett branching=E2=80=94most cleanly applies=
to a single Level I=20
infinite universe. In other words, while our own =E2=80=9Cbubble=E2=80=9D s=
plits and recombines=20
continuously in terms of the ordinary MWI branching of each of its constitu=
ent=20
systems, extending this somehow to a whole set of =E2=80=9Cbubbles=E2=80=9D=
is not clear and=20
probably problematic.</DIV>
<DIV> </DIV>
<DIV>I=E2=80=99m even worried about what seems to be some cosmologists will=
ing use of=20
the time parameter =E2=80=9Ct=E2=80=9D as somehow *simultaneously* applicab=
le across more than=20
just one bubble universe! I mean, it=E2=80=99s even a stretch (though one t=
hat is=20
coherent and which I accept) to identify far away galaxies in our universe =
whose=20
inhabitants find themselves also at 13.8 AB (After Bang) as experiencing th=
e=20
same =E2=80=9Cnow=E2=80=9D that we do. But even this identification should =
have only limited=20
utility (I would think). To then carry it further outside our Level I infin=
ite=20
universe appears to me to border on being incoherent.</DIV>
<DIV> </DIV>
<DIV>I would love to hear any comments you have about any of this.</DIV>
<DIV>Thanks,</DIV>
<DIV>Lee</DIV>
<DIV> </DIV></DIV></DIV>
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