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Insights A Poor Man's CMB Primer Part 0: Orientation - Comments

  1. Sep 11, 2015 #1


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    Last edited by a moderator: Sep 24, 2016
  2. jcsd
  3. Sep 11, 2015 #2
    But is space is curved, wouldn't this model be incorrect? Surely on this scale any curvature would be significant
  4. Sep 11, 2015 #3
    The curvature has been calculated from observations. It was not measurably different from zero.
  5. Sep 11, 2015 #4


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    Spacetime is curved, but space, as far as we can tell, is flat, as Hornbein says (the curvature he refers to is space curvature, or more precisely the curvature of spacelike slices which are surfaces of constant time in standard cosmological coordinates).
  6. Sep 11, 2015 #5


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    As others have commented, space has been measured to be rather flat; however, I don't see how geometry factors into anything discussed in this post. Where do you think it fits in?
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