From: scerir (scerir@libero.it)
Date: Wed Jan 08 2003 - 10:01:36 MST
[Hal Finney, in a very good post]
<But if we want to stick to naturalistic explanations,
another possibility is to suggest that all the universes
exist, each with its own set of parameters, and then life
will only evolve in those universes where that is possible.>
Found a lot of papers, about 'multiverses', Deutschean and not.
'Concluding Perspective'
- Martin J. Rees
http://arxiv.org/abs/astro-ph/0101268
To appear in New Cosmological Data and the Values of the
Fundamental Parameters, ed. A. Lasenby & A. Wilkinson
<This contribution to the concluding session at IAU Symposium 205 offered
comments on some current controversies, including the scientific status of
the ''multiverse'' concept and on the prospects for cosmology in the coming
decade.>
'Inflation, Quantum Cosmology and the Anthropic Principle'
http://arxiv.org/abs/hep-th/0211048
- Andrei Linde
To appear in "Science and Ultimate Reality:
>From Quantum to Cosmos", honoring John Wheeler's 90th birthday. J. D.
Barrow, P.C.W. Davies, & C.L. Harper eds. Cambridge University Press (2003)
<Anthropic principle can help us to understand many properties of our world.
However, for a long time this principle seemed too metaphysical and many
scientists were ashamed to use it in their research. I describe here a
justification of the weak anthropic principle in the context of inflationary
cosmology and suggest a possible way to justify the strong anthropic
principle using the concept of the multiverse.>
'Is there a Darwinian Evolution of the Cosmos?' - 'Some Comments on Lee
Smolin's Theory of the Origin of Universes by Means of Natural Selection'
http://arxiv.org/abs/gr-qc/0205119
- Ruediger Vaas
Extended version of a contribution to the MicroCosmos -
MacroCosmos conference in Aachen, Germany, September 2-5 1998; finished in
late 1998 and published in the conference proceedings (this http URL)
<For Lee Smolin, our universe is only one in a much larger cosmos (the
Multiverse) - a member of a growing community of universes, each one being
born in a bounce following the formation of a black hole. In the course of
this, the values of the free parameters of the physical laws are reprocessed
and slightly changed. This leads to an evolutionary picture of the
Multiverse, where universes with more black holes have more descendants.
Smolin concludes, that due to this kind of Cosmological Natural Selection
our own universe is the way it is. The hospitality for life of our universe
is seen as an offshot of this self-organized process. - This paper outlines
Smolin's hypothesis, its strength, weakness and limits, its relationship to
the anthropic principle and evolutionary biology, and comments on the
hypothesis from different points of view: physics, biology, philosophy of
science, philosophy of nature, and metaphysics. Some of the main points are:
(1) There is no necessary connection between black holes and life. In
principle, life and Cosmological Natural Selection could be independent of
each other. Smolin might explain the so-called fine-tuning of physical
constants, but life remains an epiphenomenon. (2) The Darwinian analogy is
an inadequate model transfer. The fitness of Smolin's universes is not
constrained by its environment, but by only one internal factor: the numbers
of black holes. Furthermore, although Smolin's universes have different
reproduction rates, they are not competing against each other. (3) Smolin's
central claim cannot be falsified.>
'The theory of Multiverse, multiplicity of physical objects and physical
constants'
http://arxiv.org/abs/gr-qc/0210072
- K. Guts
Report on 11-th International (Russian)
Gravitational Conference at Tomsk. July 1-7, 2002
<The Multiverse is collection of parallel universes. In this article a
formal
theory and a topos-theoretic models of the multiverse are given. For this
the Lawvere-Kock Synthetic Differential Geometry and topos models for smooth
infinitesimal analysis are used. Physical properties of multi-variant and
many-dimensional parallel universes are discussed. The source of
multiplicity of physical objects is set of physical constants.>
'Topos-theoretic Model of the Deutsch multiverse'
http://arxiv.org/abs/physics/0203071
- Alexander K. Guts
<The Deutsch multiverse is collection of parallel universes. In this article
a formal theory and a topos-theoretic model of the Deutsch multiverse are
given. For this the Lawvere-Kock Synthetic Differential Geometry and topos
models for smooth infinitesimal analysis are used. Physical properties of
multi-variant and many-dimensional parallel universes are discussed. Quantum
fluctuations of universe geometry are considered. Photon ghosts in parallel
universes are found.>
Somedody at http://home.earthlink.net/~xplorerx3/Multiverse.htm
says that "According to Vedic Cosmology, there are countless universes,
which are clustered together like foam on the surface of the Causal Ocean.
The universes are separated from each other by the shell that envelopes
each universe. Although the universes are clustered together, interactions
between the universes are impossible. Each universe is completely protected
by an enormous shell. Thus, each universe has a boundary. The universe is
ball shaped and surrounded by an eight-fold shell. This shell is composed
of primeval material elements in their most subtle manifestation.
The shell consists of eight spherical layers in which each successive
material element is manifested and stored. If we penetrate the universal
shell consisting of these eight spherical layers, we will enter the
universal globe and find a hollow region containing all the inhabited
planets".
Wikipedia at http://www.wikipedia.org/wiki/Multiverse
says that "A multiverse of a somewhat different kind has been envisaged
within the 11-dimensional extension of string theory known as M-theory.
In M-theory our universe and others are created by collisions between
membranes in an 11-dimensional space. Unlike the universes in the quantum
multiverse, these universes can have completely different laws of physics
- anything may be possible".
Anything may be possible? I do not know but a multiverse exhibition
is already here http://computerart.org/g0016.html .
A dialogue at http://www.lns.cornell.edu/spr/2000-09/msg0027976.html
shows that the multiverse issue can be ... dangerous :-)
Mr.1 - Worlds are eternal, as the Heisenberg picture shows.
Mr.2 - I don't follow you here? Do you mean a world is a state,
which doesn't change with time?
Mr.1 - The threading is messed up, and I can't figure out why I said that.
The state of the universe is, of course, eternal in the H picture,
but I don't remember what I was getting at by mentioning that.
Can you find what it was I was replying to?
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