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Re: closed universe, flat space?
Posted:
Apr 24, 2013 9:39 AM


In <MPG.2be10223655ef8e343@news.eternalseptember.org>, on 04/23/2013 at 09:40 PM, Poutnik <poutnik@privacy.invalid> said:
>RichD posted Tue, 23 Apr 2013 12:23:30 0700 (PDT)
>> >> Supposedly, our universe is closed and finite, although the >> geometry and topology isn't precisely known. This means >> a straight line (geodesic) traveler must return to his starting >> poiint, yes/no? Hence, curved space. >> >> At the same time, astronomers claim, that space is flat, to >> the precision of their measurements. Usually, this is >> accompanied by the comment that the universe is balanced >> between infinite expansion, or eventual collapse, we can't >> tell which. >> >> So, space is closed, but also flat... back in my day, they >> had something called a logical contradiction, which was >> considered a bad thing, but I guess times change... >> viva progress 
>The question is  Is supposed value of expected curvature of space >statistically significant wrt error of measured flatness ?
No, the questions are why the OP is making a false claim and and why the OP is falsely claiming a logical contradiction.
"Supposedly, our universe is closed and finite" is untrue; what is true is that GR allows for the possibility and that a sufficiently latge density of matter would require it. The observed density isn't large enough.
What is worse is that there is no logical contradiction between a closed universe and a flat universe.
 Shmuel (Seymour J.) Metz, SysProg and JOAT <http://patriot.net/~shmuel>
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