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I am working on the problems of Wald's General Relativity. I came across this difficult problem: the 4th problem in Chapter 6.

Part (a) is easy, but I cannot figure out how to prove part (b). Prof. Wald suggested to use the so-called conservation of energy, but [itex]u^{a}[/itex] isn't a geodesic tangent vector. So I feel confused.

I need your help! Thank you!

qinglong.1397

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# Was Wald wrong? A question with the problem 4 in Chapter 6

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