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SpECTRE
v2025.08.19
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The factor multiplying the angular derivative in the principal part of the equations. More...
#include <Tags.hpp>
Public Types | |
| using | type = Scalar< ComplexDataVector > |
The factor multiplying the angular derivative in the principal part of the equations.
This is the factor \(\alpha\) that defines the principal part of the equations and allows to write it in first-order flux form given by
\begin{equation} -\partial_i F^i + \beta \Psi_m + \gamma_i F^i = S_m \end{equation}
with the flux
\begin{equation} F^i = \{\partial_{r_\star}, \alpha \partial_{\cos\theta}\} \Psi_m \text{.} \end{equation}
This factor is set by the analytic data class (see ScalarSelfForce::AnalyticData::CircularOrbit).