PSI Blog 20170216 Number of
oxymoronic “multiverses” calculated
Without tongue in
cheek or facepalm, MIT blessed a cosmogonical mess that is now over seven years
old:
Physicists Calculate Number of Universes in the Multiverse
This actually was published in Physical Review:
Linde, Andrei, and
Vanchurin, Vitaly, 2010, How many universes are in the multiverse?: Physical
Review D, v. 81, no. 8, p. 083525
[http://link.aps.org/doi/10.1103/PhysRevD.81.083525].
You can get a review copy
from arXiv:
Here is the abstract (if
you really care):
“We argue that the total
number of distinguishable locally Friedmann “universes” generated by eternal
inflation is proportional to the exponent of the entropy of inflationary
perturbations and is limited by ee3N, where N is the number of e-folds of
slow-roll posteternal inflation. For simplest models of chaotic inflation, N is
approximately equal to de Sitter entropy at the end of eternal inflation; it
can be exponentially large. However, not all of these universes can be observed
by a local observer. In the presence of a cosmological constant Λ the number of
distinguishable universes is bounded by e|Λ|−3/4. In the context of the string
theory landscape, the overall number of different universes is expected to be
exponentially greater than the total number of vacua in the landscape. We
discuss the possibility that the strongest constraint on the number of
distinguishable universes may be related not to the properties of the
multiverse but to the properties of observers.”
Egads!
Look what you can get published as long as you are a believer in the Big Bang
Theory.
Oh well, at least they are
getting closer to accepting that the universe is infinite!
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