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From: ethan@utastro.UUCP
Newsgroups: net.physics,net.astro,net.astro.expert
Subject: correction to ftl expansion
Message-ID: <22@utastro.UUCP>
Date: Thu, 24-May-84 11:52:59 EDT
Article-I.D.: utastro.22
Posted: Thu May 24 11:52:59 1984
Date-Received: Thu, 31-May-84 19:34:43 EDT
Organization: UTexas Astronomy Dept., Austin, Texas
Lines: 20

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I made an error in my last submission.

>     Now, if space is flat (like a critically bound model universe) then
>there is a global coordinate system in which nobody is moving "faster than
>light" i.e. there are no two points whose increase in spatial separation
>per unit time is greater than the speed of light.  

Wrong.  If space is empty (open universe, infinitesimal matter density)
then such a global coordinate system exists because the space-time can
be transformed to ordinary minkowski space.  (flat, empty, isotropic
and homogeneous, this is the space where special relativity becomes
exactly true).
                         
"Cute signoffs are for   Ethan Vishniac
         perverts"       {charm,ut-sally,ut-ngp,noao}!utastro!ethan
                         Department of Astronomy
                         University of Texas
                         Austin, Texas 78712