Compute item to get time derivative of lapse ( \(\alpha\)) from the generalized harmonic variables, lapse, shift and the spacetime unit normal 1-form.
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template<size_t SpatialDim, typename Frame>
struct gh::Tags::TimeDerivLapseCompute< SpatialDim, Frame >
Compute item to get time derivative of lapse ( \(\alpha\)) from the generalized harmonic variables, lapse, shift and the spacetime unit normal 1-form.
Details
See time_deriv_of_lapse(). Can be retrieved using gr::Tags::Lapse wrapped in Tags::dt.