- #1

Nick2014

- 6

- 0

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