Re: Tipler paper

Date: Wed Nov 14 2001 - 23:45:26 MST

In a paper displaying a somewhat, similar, view as Tipler's, are two
power-houses of cosmology; Steinhardt and Turok. Their viewpoint does not
concern itself with the survival of intelligence, but rather how the basic
phenomena of the universe may behave; given new insights such as brane
theories and the ekpyrosis hypothesis.

Title: Cosmic Evolution in a Cyclic Universe
Authors: <A HREF="">Paul J. Steinhardt</A>, <A HREF="">Neil Turok</A>
Comments: 49 pages, 6 figures

arXiv: hep- th/ 0111098 v1 12 Nov 2001
Cosmic Evolution in a Cyclic Universe
Paul J. Steinhardt 1 and Neil Turok 2
1 Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544,
2 DAMTP, CMS, Wilberforce Road, Cambridge, CB3 0WA, UK

Based on concepts drawn from the ekpyrotic scenario and M-theory, we elab-
orate our recent proposal of a cyclic model of the Universe. In this model,
the Universe undergoes an endless sequence of cosmic epochs which begin
with the Universe expanding from a `big bang' and end with the Universe
contracting to a `big crunch.' Matching from `big crunch' to `big bang' is
formed according to the prescription recently proposed with Khoury, Ovrut
and Seiberg. The expansion part of the cycle includes a period of radiation
and matter domination followed by an extended period of cosmic accelera-
tion at low energies. The cosmic acceleration is crucial in establishing the
at and vacuous initial conditions required for ekpyrosis and for removing
the entropy, black holes, and other debris produced in the preceding cycle.
By restoring the Universe to the same vacuum state before each big crunch,
the acceleration insures that the cycle can repeat and that the cyclic
is an attractor.

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