SpECTRE
v2023.09.07

Auxiliary variable which is analytically the spatial derivative of the natural log of the conformal factor. More...
#include <Tags.hpp>
Public Types  
using  type = tnsr::i< DataType, Dim, Frame > 
Auxiliary variable which is analytically the spatial derivative of the natural log of the conformal factor.
If \(\phi\) is the conformal factor, then we define \(P_i = \partial_i ln(\phi) = \frac{\partial_i \phi}{\phi}\).