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Classification of gravitational theories

  1. Jul 2, 2013 #1

    there are many gravitational theories such as
    1- modified gravity { massive gravity, dilaton gravity, .... }
    2-conformal gravity
    3-emergent gravity
    4-lower and highest dimensional gravity

    is anybody know about this gravitational theories?
    is there a general classification of these theories that tell us all of these theories and state the features and properties of these?
    are these related to petrov classification that states http://en.wikipedia.org/wiki/Petrov_classification

  2. jcsd
  3. Jul 2, 2013 #2


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  4. Jul 2, 2013 #3


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    Non-vacuum as well. In either case it pertains to the eigenvectors of the Weyl tensor. The Reissner-Nordstrom solution, for example, is Type D.
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