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How does one evaluate gravity actions on Graham-Fefferman expansions?

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In this paper, http://arxiv.org/abs/1004.2055 how was equation 3.5 obtained?

(presumably equations 3.3 and 3.4 were substituted into equation 2.1 to get it - but that looks like a dangerously difficult calculation! Is there some trick here that I am missing or is this somehow programmable into Mathematica?)

asked Jun 14, 2014 in Theoretical Physics by curiousgradstudent (65 points) [ no revision ]

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