SpECTRE
v2023.01.13

The CCZ4 temporary expression \(K  K_0  2 \Theta c\). More...
#include <TempTags.hpp>
Public Types  
using  type = Scalar< DataType > 
The CCZ4 temporary expression \(K  K_0  2 \Theta c\).
Here, \(K\) is the trace of the extrinsic curvature defined by gr::Tags::TraceExtrinsicCurvature
, \(K_0\) is the initial time derivative of the lapse, \(\Theta\) is the projection of the Z4 fourvector along the normal direction, and \(c\) controls whether to include algebraic source terms proportional to \(\Theta\).