SpECTRE
v2023.01.13

Auxiliary variable which is analytically the spatial derivative of the scalar field. More...
#include <Tags.hpp>
Public Types  
using  type = tnsr::i< DataVector, SpatialDim > 
Auxiliary variable which is analytically the spatial derivative of the scalar field.
If \(\Psi\) is the scalar field then we define \(\Phi_{i} = \partial_i \Psi\)