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From: gwyn@brl-vgr.ARPA (Doug Gwyn )
Newsgroups: net.physics,net.astro.expert
Subject: Re: simplicity and symmetry in cosmology
Message-ID: <2143@brl-vgr.ARPA>
Date: Thu, 17-May-84 15:39:07 EDT
Article-I.D.: brl-vgr.2143
Posted: Thu May 17 15:39:07 1984
Date-Received: Fri, 18-May-84 06:04:03 EDT
References: <294@utastro.UUCP>
Organization: Ballistics Research Lab
Lines: 25

Under the particular formulation of the Einstein-Schr"odinger theory
that is most similar in form to General Relativity, and using the
traditional (but not unquestioned!) identification of the entities in
the formalism with aspects of the actual physical world, then it is
indeed the case that a particularly symmetric special solution of the
field equations is a deSitter universe.  This means that the extended
theory is certainly capable of "predicting" the Hubble effect.  Whether
this is the only reasonable cosmology one can have for this theory is
another matter.  I am not very familiar with the "diverging geodesic"
argument Ethan has stated but I do know that geodesics do not mean
quite the same thing in a pure affine theory.  I would like to look
into this further.

I do not relate the theory to current developments in cosmology
since in those cases where General Relativity is expected to be
sufficiently valid (low energy density, medium scale of distance,
and so forth) the extended theory should give comparable predictions
if one uses the same methodology for the non-General Relativistic
considerations (quantization or what have you).  However, it is not
the aim of the E-S theory to apply only in a limited problem domain
with other methods imposed outside that domain.  It is supposed to
be complete (although I will certainly admit that the formulation
of the theory does not guarantee that all relevant factors have
been included; I consider that an open question although most
theorists would disagree).