I am looking at circular orbits in the Schwarzschild metric and the energy associated with them. In places I look the energy is given as: E=(1−rsr)dtdτ=r−2GMr(1−3GM)
examples of where this is done is Moore, 2013 pg 126 and Baumgarte & Shapiro, 2010 pg10. But is the energy not simply given by the zeroth component of the 4-momentum i.e.: E=dtdτ=r−2GMr(1−3GM)(1−rsr)
where deos the extra factor of 1−rsr come from and which is the correct expression?
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