Thursday, November 12, 2015

homework and exercises - Energy of a circular orbit in the Schwarzschild metric?


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=(1rsr)dtdτ=r2GMr(13GM)

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=r2GMr(13GM)(1rsr)
where deos the extra factor of 1rsr come from and which is the correct expression?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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