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Reissner Nordstrom Metric

  1. Sep 21, 2015 #1
    I want to derive Reissner Nordstrom solution using this paper as a guide: http://gmammado.mysite.syr.edu/notes/RN_Metric.pdf, but I get confused by the Eq. (8). Why the Enstein's equation can be rewritten in that form and what is the physical meaning of the Eq. (8)?
     
  2. jcsd
  3. Sep 21, 2015 #2
    Contract both sides of (3) with ##g^{\mu\nu}## and you will get a condition for ##R##
     
  4. Sep 21, 2015 #3
    Ah thank you, that's so simple >_<
     
  5. Sep 22, 2015 #4

    vanhees71

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    The trace of the energy-momentum tensor of a classical massless field vanishes because of symmetry under dilations. Now use the hint in #2.
     
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