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Homework Help: General Relativiy - Definition of a test body?

  1. Dec 10, 2014 #1
    I know it follows a geodesic in space-time, but is it not being able to bend space-time itself, part of the definition?

    When I google i just find 'follows a geodesic in space-time'. I thought that it also should not bend space-time itself - but this isn't included in the definitions I've found...

    Thanks, greatly appreciated !
  2. jcsd
  3. Dec 10, 2014 #2


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    Gold Member

    I think that's part of the definition. Like the test charge used in electrostatics.
    Because if we consider the test body's gravitational field, then the gravitational self-interaction will cause the geodesic to be different from the geodesic of the space-time we were considering.
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