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  How to prove that the nonlinear completion of free massless spin-2 action must be Einstein-Hilbert action?

+ 5 like - 0 dislike

There is a saying that the nonlinear completion of free massless spin-2 action in Minkovski spacetime (that is Fierz-Pauli action) must be Einstein-Hilbert action up to Lovelock invariants. 

I find a reference tackling this problem 
Wald R M. Spin-two fields and general covariance[J]. Physical Review D, 1986, 33(12): 3613.

However in this paper it only proves that the nonlinear completion of free massless spin-2 action must be general covariant. So how to prove it must be the Einstein-Hilbert action.

asked Mar 16, 2015 in Theoretical Physics by Alienware (185 points) [ no revision ]

It must be the Einstein-Hilbert action only in the limit of low energy. In general, it can contain terms of higher dimensions. The Einstein-Hilbert action is dominant at low energy because it is the only generally covariant possibility with at most two derivatives in the metric.

2 Answers

+ 5 like - 0 dislike

The paper you are looking for is 

S. Weinberg, Photons and gravitons in perturbation theory: Derivation of Maxwell's and Einstein's equations, Physical Review B 138 (1965), B988-B1002.

answered Mar 16, 2015 by Arnold Neumaier (15,787 points) [ no revision ]

Weinberg actually states in the paper that Feynman was the one to show the uniqueness ("the only that works") of the Einstein equations - with reference only to a conversation. Is there perhaps a later paper by Feynman where he describes his analysis?

@Void: Unfortunately, I don't know, but I think it is unlikely, since a long time ago I had systematically searched related literature. 

+ 2 like - 0 dislike
answered Mar 16, 2015 by 40227 (5,140 points) [ no revision ]

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