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Axial symmetry, non-rotating

  1. Jan 31, 2012 #1
    I'm studying Bondi's work on gravitational radiation. He applied axial symmetry and reflection symmetry to a source of gravity. How is it that axial symmetry does not automatically imply reflection symmetry?

    The assumption for axial symmetry is [itex]\phi \rightarrow \phi'= \phi +[/itex] constant

    The assumption for reflection symmetry is [itex]\phi \rightarrow \phi'= -\phi[/itex]

    The first condition implies the second if the constant is [itex]-2\phi[/itex], so I don't see how the second assumption adds anything new to the source.

    Also, I read that the second assumption prohibits the solution from rotating, but I don't see why this distinction needs to be made since it is invariant under any rotation.
  2. jcsd
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