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Does gravity swirl?

  1. Jan 7, 2013 #1
    I vaguely remember learning somewhere somehow sometime that gravity doesn't just dent space-time inwards, it also swirls space-time just a bit. I remember learning this because it was visually depicted using honey. However, now that I try to find out more, I can't seem to find any reference to this swirling effect at all, either positive or negative. It's simply never mentioned. Is it actually true? And if so, why? Why does gravity swirl?
     
  2. jcsd
  3. Jan 7, 2013 #2
  4. Jan 7, 2013 #3

    Dale

    Staff: Mentor

    It appears to be correct, but the current precision of the relevant measurement is pretty poor.

    http://en.wikipedia.org/wiki/Gravity_Probe_B

    As far as "why", science cannot really answer "why" questions, except in terms of a more fundamental theory. Currently, general relativity is our fundamental theory of gravity, so we cannot answer "why" questions about it until we develop a more fundamental theory.

    What we can answer is "how". Energy, momentum, and stress all contribute to gravity in GR through the EFE. This is different from Newtonian gravity where momentum does not contribute.
     
  5. Jan 7, 2013 #4

    Nugatory

    User Avatar

    Staff: Mentor

    Also check wikipedia and google for the "Kerr metric" and "Kerr black holes"; that's the solution that describes the swirling/frame-dragging effect around a massive rotating body.
     
  6. Jan 7, 2013 #5
  7. Jan 8, 2013 #6
    Do you know more about this missions? How did they account for quadrupole and higher "pole" from the asymmetry of the earth? How did they account for the effects of the sun and moon on the probe?
     
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