Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Almost-universe-sized black hole

  1. Sep 14, 2007 #1
    What if acceleration is really an attraction to something surrounding us?

    What would happen if a black hole gained size over the history of the universe until it comprised a huge percentage of the universe? And what if that universe was curved so that as the black hole expanded, it began to approach itself on the other side, like drawing larger and larger circles on a ball? What would the observer in the remaining part of the universe see as this black hole closed up? Wouldn't it look like accelerating expansion as the galaxies are pulled toward the monster black hole all around them with greater and greater force? Does this model have any correlation with anything in the real world or am I a crackpot? Has anyone looked at this?

    Basically the idea is: What if expansion is really being attracted to something which surrounds us instead of being propelled outward from within?
    Last edited: Sep 14, 2007
  2. jcsd
  3. Sep 14, 2007 #2


    User Avatar
    Science Advisor

    Then the velocities of galaxies would not be proportional to the distance, contradicting the observed Hubble law (or perhaps we would have a privileged role of being in the center of the universe).
    And of course, there would be no cosmic microwave background.

    But this belongs to the Cosmology subforum.
    Last edited: Sep 14, 2007
  4. Sep 14, 2007 #3
    What if it was so far away that even if you weren't exactly in the center you wouldn't be able to get enough accuracy on your measurements to tell the difference?

    Cosmic background is a big problem, though. I didn't think of that. Any way that the cosmic background could be closer to us than the event horizon of this black hole? What if it's actually the material falling into it? It's a stretch I know.

    Sorry about posting to the wrong subforum.
    Last edited: Sep 14, 2007
  5. Sep 14, 2007 #4


    User Avatar
    Staff Emeritus
    Science Advisor

    But that means we're pretty much in the centre of the universe (since your black hole is on the same scale as the size of the universe). This does not agree with the cosmological principle.

    Yes, this is cosmology and thus, if appropriate to any forum, would belong there.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook