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I have a "great" problem with EGB action. First of all, I'm used to work with potential and scalar field, but now I have the following action

##S=\int\sqrt{-g}\left(2\beta +R+\alpha GB\right)d^6 x##

where GB is the six-dimensional Gauss-Bonnet term, R is the scalar curvature and ##2\beta## is a cosmological constant. ##\alpha## is a coupling parameter. Well, I want to write Einstein equations, but I don't know how to calculate stress-energy tensor ##T##... Thanks in advance

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# Field equations Einstein-Gauss-Bonnet action

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