SpECTRE
v2022.09.02

The divergence of the lapse. More...
#include <Tags.hpp>
Public Types  
using  type = Scalar< DataType > 
The divergence of the lapse.
We define:
\begin{align} \nabla^i \nabla_i \alpha &= \phi^2 \tilde{\gamma}^{ij} (\nabla_i \nabla_j \alpha) \end{align}
where \(\phi\), \(\tilde{\gamma}^{ij}\), and \(\nabla_i \nabla_j \alpha\) are the conformal factor, inverse conformal spatial metric, and the gradient of the gradient of the lapse defined by Ccz4::Tags::ConformalFactor
, Ccz4::Tags::InverseConformalMetric
, and Ccz4::Tags::GradGradLapse
, respectively.