Set the inertial cylindrical angle to . The Minkowski metric becomes . For a massive geodesic parametrized by proper time, its cyclic coordinates give conserved covariant four-momentum components , and . Their combination gives . The radial Euler-Lagrange equation gives the displayed coordinate acceleration, although the free worldline is straight in inertial coordinates. The conserved inertial energy is , and the inertial axial angular momentum is .
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