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Geometry of Inflationary Universe?

  1. Apr 24, 2012 #1
    According to the Inflation Theory our Observable Universe is but a small part of the total universe created in the Big Bang.
    Our observable universe appears to be flat (just like Earth at sea level may appear flat), while the total universe may be shaped like a balloon.
    If we assume our observable universe was at one specific area in the pre-inflation universe, and other areas are now other universes no longer in causal contact with our universe, what lies between the universes?
    Is there a uniform distribution of mass in the total universe, with each universe just being defined by how far one can observe in any direction? So our observable universe is slightly different from the observable universe of any sentient beings in the Andromeda galaxy?
    Or is the observable universes like a galaxies or galaxy clusters, with vast expanses of empty space between them?
    Last edited: Apr 24, 2012
  2. jcsd
  3. Apr 24, 2012 #2
    Octavianus, the observable universe just represents all that an observer can see, his light cone. Since light has a finite speed, and the universe is of finite age, you can only see so much. Different observers obviously have different observable universes, it is purely dependent on where you are located and how long the universe has existed. So, the universe is homogeneous and isotropic, regardless of your observable universe.
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